evdev: don't debug log on a BTN_TOUCH from a non-touch device.

src/core/linux/SDL_evdev.c

@@ -448,9 +448,15 @@ SDL_EVDEV_translate_keycode(int keycode)
         scancode = linux_scancode_table[keycode];
 
     if (scancode == SDL_SCANCODE_UNKNOWN) {
-        SDL_Log("The key you just pressed is not recognized by SDL. To help "
-            "get this fixed, please report this to the SDL forums/mailing list "
-            "<https://discourse.libsdl.org/> EVDEV KeyCode %d", keycode);
+        /* BTN_TOUCH is handled elsewhere, but we might still end up here if
+           you get an unexpected BTN_TOUCH from something SDL believes is not
+           a touch device. In this case, we'd rather not get a misleading
+           SDL_Log message about an unknown key. */
+        if (keycode != BTN_TOUCH) {
+            SDL_Log("The key you just pressed is not recognized by SDL. To help "
+                "get this fixed, please report this to the SDL forums/mailing list "
+                "<https://discourse.libsdl.org/> EVDEV KeyCode %d", keycode);
+        }
     }
 
     return scancode;