Abstract SDL success/failure checks inside a compat macro

app/main.cpp

@@ -515,7 +515,7 @@ int main(int argc, char *argv[])
     // The DXVA2 renderer uses Direct3D 9Ex itself directly.
     SDL_SetHint(SDL_HINT_WINDOWS_USE_D3D9EX, "1");
 
-    if (SDL_InitSubSystem(SDL_INIT_TIMER) != 0) {
+    if (SDLC_FAILURE(SDL_InitSubSystem(SDL_INIT_TIMER))) {
         SDL_LogError(SDL_LOG_CATEGORY_APPLICATION,
                      "SDL_InitSubSystem(SDL_INIT_TIMER) failed: %s",
                      SDL_GetError());
@@ -525,7 +525,7 @@ int main(int argc, char *argv[])
 #ifdef STEAM_LINK
     // Steam Link requires that we initialize video before creating our
     // QGuiApplication in order to configure the framebuffer correctly.
-    if (SDL_InitSubSystem(SDL_INIT_VIDEO) != 0) {
+    if (SDLC_FAILURE(SDL_InitSubSystem(SDL_INIT_VIDEO)) {
         SDL_LogError(SDL_LOG_CATEGORY_APPLICATION,
                      "SDL_InitSubSystem(SDL_INIT_VIDEO) failed: %s",
                      SDL_GetError());