x11: Dedup the X11_FindWindow() function

The was duplicated in the XInput2 code, but taking an SDL_VideoData parameter instead of SDL_VideoDevice. Remove the duplicated XInput2 function, and use an SDL_VideoData parameter for X11_FindWindow to avoid an unnecessary dereference.

src/video/x11/SDL_x11events.c

@@ -1011,13 +1011,10 @@ static int XLookupStringAsUTF8(XKeyEvent *event_struct, char *buffer_return, int
     return result;
 }
 
-SDL_WindowData *X11_FindWindow(SDL_VideoDevice *_this, Window window)
+SDL_WindowData *X11_FindWindow(SDL_VideoData *videodata, Window window)
 {
-    const SDL_VideoData *videodata = _this->internal;
-    int i;
-
     if (videodata && videodata->windowlist) {
-        for (i = 0; i < videodata->numwindows; ++i) {
+        for (int i = 0; i < videodata->numwindows; ++i) {
             if ((videodata->windowlist[i] != NULL) &&
                 (videodata->windowlist[i]->xwindow == window)) {
                 return videodata->windowlist[i];
@@ -1341,7 +1338,7 @@ static void X11_DispatchEvent(SDL_VideoDevice *_this, XEvent *xevent)
     // xsettings internally filters events for the windows it watches
     X11_HandleXsettingsEvent(_this, xevent);
 
-    data = X11_FindWindow(_this, xevent->xany.window);
+    data = X11_FindWindow(videodata, xevent->xany.window);
 
     if (!data) {
         // The window for KeymapNotify, etc events is 0

src/video/x11/SDL_x11events.h

@@ -33,7 +33,7 @@ extern Uint64 X11_GetEventTimestamp(unsigned long time);
 extern void X11_HandleKeyEvent(SDL_VideoDevice *_this, SDL_WindowData *windowdata, SDL_KeyboardID keyboardID, XEvent *xevent);
 extern void X11_HandleButtonPress(SDL_VideoDevice *_this, SDL_WindowData *windowdata, SDL_MouseID mouseID, int button, float x, float y, unsigned long time);
 extern void X11_HandleButtonRelease(SDL_VideoDevice *_this, SDL_WindowData *windowdata, SDL_MouseID mouseID, int button, unsigned long time);
-extern SDL_WindowData *X11_FindWindow(SDL_VideoDevice *_this, Window window);
+extern SDL_WindowData *X11_FindWindow(SDL_VideoData *videodata, Window window);
 extern bool X11_ProcessHitTest(SDL_VideoDevice *_this, SDL_WindowData *data, const float x, const float y, bool force_new_result);
 extern bool X11_TriggerHitTestAction(SDL_VideoDevice *_this, SDL_WindowData *data, const float x, const float y);
 extern bool X11_IsWheelEvent(int button, int *xticks, int *yticks);

src/video/x11/SDL_x11xinput2.c

@@ -130,22 +130,9 @@ static bool xinput2_version_atleast(const int version, const int wantmajor, cons
     return version >= ((wantmajor * 1000) + wantminor);
 }
 
-// !!! FIXME: isn't this just X11_FindWindow?
-static SDL_WindowData *xinput2_get_sdlwindowdata(SDL_VideoData *videodata, Window window)
-{
-    int i;
-    for (i = 0; i < videodata->numwindows; i++) {
-        SDL_WindowData *d = videodata->windowlist[i];
-        if (d->xwindow == window) {
-            return d;
-        }
-    }
-    return NULL;
-}
-
 static SDL_Window *xinput2_get_sdlwindow(SDL_VideoData *videodata, Window window)
 {
-    const SDL_WindowData *windowdata = xinput2_get_sdlwindowdata(videodata, window);
+    const SDL_WindowData *windowdata = X11_FindWindow(videodata, window);
     return windowdata ? windowdata->window : NULL;
 }
 
@@ -519,7 +506,7 @@ void X11_HandleXinput2Event(SDL_VideoDevice *_this, XGenericEventCookie *cookie)
         // Handle pen proximity enter/leave
         if (proev->what == XIPropertyModified && proev->property == videodata->atoms.pen_atom_wacom_serial_ids) {
             const XIDeviceEvent *xev = (const XIDeviceEvent *)cookie->data;
-            SDL_WindowData *windowdata = X11_FindWindow(_this, xev->event);
+            SDL_WindowData *windowdata = X11_FindWindow(videodata, xev->event);
             X11_NotifyPenProximityChange(_this, windowdata ? windowdata->window : NULL, proev->deviceid);
         }
     } break;
@@ -546,7 +533,7 @@ void X11_HandleXinput2Event(SDL_VideoDevice *_this, XGenericEventCookie *cookie)
     case XI_KeyRelease:
     {
         const XIDeviceEvent *xev = (const XIDeviceEvent *)cookie->data;
-        SDL_WindowData *windowdata = X11_FindWindow(_this, xev->event);
+        SDL_WindowData *windowdata = X11_FindWindow(videodata, xev->event);
         XEvent xevent;
 
         if (xev->deviceid != xev->sourceid) {
@@ -615,7 +602,7 @@ void X11_HandleXinput2Event(SDL_VideoDevice *_this, XGenericEventCookie *cookie)
             }
         } else if (!pointer_emulated) {
             // Otherwise assume a regular mouse
-            SDL_WindowData *windowdata = xinput2_get_sdlwindowdata(videodata, xev->event);
+            SDL_WindowData *windowdata = X11_FindWindow(videodata, xev->event);
             int x_ticks = 0, y_ticks = 0;
 
             // Slave pointer devices don't have button remapping applied automatically, so do it manually.