joystick: Always continue processing GIP packets

This loop breakout was originally from an attempt to parse coalesced packets.
Breaking out early does more harm than good, and no devices coalesce packets,
so this is unnecessary.

src/joystick/hidapi/SDL_hidapi_gip.c

@@ -2171,7 +2171,7 @@ static bool GIP_HandleMessage(
     return false;
 }
 
-static int GIP_ReceivePacket(GIP_Device *device, const Uint8 *bytes, int num_bytes)
+static void GIP_ReceivePacket(GIP_Device *device, const Uint8 *bytes, int num_bytes)
 {
     GIP_Header header;
     int offset = 3;
@@ -2183,7 +2183,7 @@ static int GIP_ReceivePacket(GIP_Device *device, const Uint8 *bytes, int num_byt
     GIP_Attachment* attachment;
 
     if (num_bytes < 5) {
-        return -1;
+        return;
     }
 
     header.message_type = bytes[0];
@@ -2216,7 +2216,7 @@ static int GIP_ReceivePacket(GIP_Device *device, const Uint8 *bytes, int num_byt
             }
             offset += GIP_DecodeLength(&total_length, &bytes[offset], num_bytes - offset);
             if (total_length > MAX_MESSAGE_LENGTH) {
-                return -1;
+                return;
             }
             attachment->total_length = (Uint16) total_length;
             attachment->fragment_message = header.message_type;
@@ -2224,13 +2224,13 @@ static int GIP_ReceivePacket(GIP_Device *device, const Uint8 *bytes, int num_byt
                 SDL_LogWarn(SDL_LOG_CATEGORY_INPUT,
                     "GIP: Received fragment that claims to be %" SDL_PRIu64 " bytes, expected %i",
                     header.length, num_bytes - offset);
-                return -1;
+                return;
             }
             if (header.length > total_length) {
                 SDL_LogWarn(SDL_LOG_CATEGORY_INPUT,
                     "GIP: Received too long fragment, %" SDL_PRIu64 " bytes, exceeds %d",
                     header.length, attachment->total_length);
-                return -1;
+                return;
             }
             attachment->fragment_data = SDL_malloc(attachment->total_length);
             SDL_memcpy(attachment->fragment_data, &bytes[offset], (size_t) header.length);
@@ -2243,7 +2243,7 @@ static int GIP_ReceivePacket(GIP_Device *device, const Uint8 *bytes, int num_byt
                     "GIP: Received out of sequence message type %02x, expected %02x",
                     header.message_type, attachment->fragment_message);
                 GIP_FragmentFailed(attachment, &header);
-                return -1;
+                return;
             }
 
             offset += GIP_DecodeLength(&fragment_offset, &bytes[offset], num_bytes - offset);
@@ -2251,16 +2251,17 @@ static int GIP_ReceivePacket(GIP_Device *device, const Uint8 *bytes, int num_byt
                 SDL_LogWarn(SDL_LOG_CATEGORY_INPUT,
                     "GIP: Received out of sequence fragment, (claimed %" SDL_PRIu64 ", expected %d)",
                     fragment_offset, attachment->fragment_offset);
-                return GIP_Acknowledge(device,
+                GIP_Acknowledge(device,
                     &header,
                     attachment->fragment_offset,
                     (Uint16) (attachment->total_length - attachment->fragment_offset));
+                return;
             } else if (fragment_offset + header.length > attachment->total_length) {
                 SDL_LogWarn(SDL_LOG_CATEGORY_INPUT,
                     "GIP: Received too long fragment, %" SDL_PRIu64 " exceeds %d",
                     fragment_offset + header.length, attachment->total_length);
                 GIP_FragmentFailed(attachment, &header);
-                return -1;
+                return;
             }
 
             bytes_remaining = attachment->total_length - (Uint16) (fragment_offset + header.length);
@@ -2282,7 +2283,7 @@ static int GIP_ReceivePacket(GIP_Device *device, const Uint8 *bytes, int num_byt
         SDL_LogWarn(SDL_LOG_CATEGORY_INPUT,
             "GIP: Received message with erroneous length (claimed %" SDL_PRIu64 ", actual %d), discarding",
             header.length + offset, num_bytes);
-        return -1;
+        return;
     } else {
         num_bytes -= offset;
         bytes += offset;
@@ -2293,7 +2294,6 @@ static int GIP_ReceivePacket(GIP_Device *device, const Uint8 *bytes, int num_byt
     if (ok && (header.flags & GIP_FLAG_ACME)) {
         GIP_Acknowledge(device, &header, (Uint32) fragment_offset, bytes_remaining);
     }
-    return offset + (Uint16) header.length;
 }
 
 static void HIDAPI_DriverGIP_RumbleSent(void *userdata)
@@ -2611,10 +2611,7 @@ static bool HIDAPI_DriverGIP_UpdateDevice(SDL_HIDAPI_Device *device)
 
     while ((num_bytes = SDL_hid_read_timeout(device->dev, bytes, sizeof(bytes), ctx->timeout)) > 0) {
         ctx->timeout = 0;
-        int parsed = GIP_ReceivePacket(ctx, bytes, num_bytes);
-        if (parsed <= 0) {
-            break;
-        }
+        GIP_ReceivePacket(ctx, bytes, num_bytes);
     }
 
     timestamp = SDL_GetTicks();