testaudio: use SDL_APP_FAILURE macro to signal failure

test/testaudio.c

@@ -1119,12 +1119,12 @@ int SDL_AppInit(void **appstate, int argc, char *argv[])
 
     SetDefaultTitleBar();
 
-    if ((physdev_texture = CreateTexture("physaudiodev.bmp")) == NULL) { return -1; }
-    if ((logdev_texture = CreateTexture("logaudiodev.bmp")) == NULL) { return -1; }
-    if ((audio_texture = CreateTexture("audiofile.bmp")) == NULL) { return -1; }
-    if ((trashcan_texture = CreateTexture("trashcan.bmp")) == NULL) { return -1; }
-    if ((soundboard_texture = CreateTexture("soundboard.bmp")) == NULL) { return -1; }
-    if ((soundboard_levels_texture = CreateTexture("soundboard_levels.bmp")) == NULL) { return -1; }
+    if ((physdev_texture = CreateTexture("physaudiodev.bmp")) == NULL) { return SDL_APP_FAILURE; }
+    if ((logdev_texture = CreateTexture("logaudiodev.bmp")) == NULL) { return SDL_APP_FAILURE; }
+    if ((audio_texture = CreateTexture("audiofile.bmp")) == NULL) { return SDL_APP_FAILURE; }
+    if ((trashcan_texture = CreateTexture("trashcan.bmp")) == NULL) { return SDL_APP_FAILURE; }
+    if ((soundboard_texture = CreateTexture("soundboard.bmp")) == NULL) { return SDL_APP_FAILURE; }
+    if ((soundboard_levels_texture = CreateTexture("soundboard_levels.bmp")) == NULL) { return SDL_APP_FAILURE; }
 
     LoadStockWavThings();
     CreateTrashcanThing();