Pointer as bool (libsdl-org#7214)

src/filesystem/android/SDL_sysfilesystem.c

@@ -40,7 +40,7 @@ char *SDL_GetPrefPath(const char *org, const char *app)
     if (path) {
         size_t pathlen = SDL_strlen(path) + 2;
         char *fullpath = (char *)SDL_malloc(pathlen);
-        if (fullpath == NULL) {
+        if (!fullpath) {
             SDL_OutOfMemory();
             return NULL;
         }