sdl3: Fixed some SDL_Init* calls that now return bool instead of int.

Author: icculus

mojoal.c

@@ -2477,7 +2477,7 @@ static const ALCchar *calculate_sdl_device_list(const int iscapture)
     ptr += cpy + 1;  // skip past null char.
     avail -= cpy + 1;
 
-    if (SDL_InitSubSystem(SDL_INIT_AUDIO) == -1) {
+    if (!SDL_InitSubSystem(SDL_INIT_AUDIO)) {
         return NULL;
     }
 

tests/testposition.c

@@ -254,7 +254,7 @@ int main(int argc, char **argv)
         return 1;
     }
 
-    if (SDL_Init(SDL_INIT_VIDEO) == -1) {
+    if (!SDL_Init(SDL_INIT_VIDEO)) {
         fprintf(stderr, "SDL_Init(SDL_INIT_VIDEO) failed: %s\n", SDL_GetError());
         return 2;
     }