Fixed build error on Linux

src/video/SDL_video.c

@@ -3857,6 +3857,9 @@ SDL_ComputeDiagonalDPI(int hpix, int vpix, float hinches, float vinches)
 				   SDL_sqrt((double)den2));
 }
 
+/*
+ * Functions used by iOS application delegates
+ */
 void SDL_OnApplicationWillTerminate()
 {
     SDL_SendAppEvent(SDL_APP_TERMINATING);
@@ -3870,6 +3873,7 @@ void SDL_OnApplicationDidReceiveMemoryWarning()
 void SDL_OnApplicationWillResignActive()
 {
     SDL_VideoDevice *_this = SDL_GetVideoDevice();
+
     if (_this) {
         SDL_Window *window;
         for (window = _this->windows; window != NULL; window = window->next) {
@@ -3892,9 +3896,10 @@ void SDL_OnApplicationWillEnterForeground()
 
 void SDL_OnApplicationDidBecomeActive()
 {
+    SDL_VideoDevice *_this = SDL_GetVideoDevice();
+
     SDL_SendAppEvent(SDL_APP_DIDENTERFOREGROUND);
 
-    SDL_VideoDevice *_this = SDL_GetVideoDevice();
     if (_this) {
         SDL_Window *window;
         for (window = _this->windows; window != NULL; window = window->next) {