SDL_Init zero check

code/sdl/sdl_glimp.c

@@ -491,7 +491,7 @@ static qboolean GLimp_StartDriverAndSetMode(int mode, qboolean fullscreen, qbool
 	{
 		const char *driverName;
 
-		if (SDL_Init(SDL_INIT_VIDEO) == -1)
+		if (SDL_Init(SDL_INIT_VIDEO) != 0)
 		{
 			ri.Printf( PRINT_ALL, "SDL_Init( SDL_INIT_VIDEO ) FAILED (%s)\n", SDL_GetError());
 			return qfalse;

code/sdl/sdl_input.c

@@ -431,7 +431,7 @@ static void IN_InitJoystick( void )
 	if (!SDL_WasInit(SDL_INIT_JOYSTICK))
 	{
 		Com_DPrintf("Calling SDL_Init(SDL_INIT_JOYSTICK)...\n");
-		if (SDL_Init(SDL_INIT_JOYSTICK) == -1)
+		if (SDL_Init(SDL_INIT_JOYSTICK) != 0)
 		{
 			Com_DPrintf("SDL_Init(SDL_INIT_JOYSTICK) failed: %s\n", SDL_GetError());
 			return;

code/sdl/sdl_snd.c

@@ -156,7 +156,7 @@ qboolean SNDDMA_Init(void)
 
 	if (!SDL_WasInit(SDL_INIT_AUDIO))
 	{
-		if (SDL_Init(SDL_INIT_AUDIO) == -1)
+		if (SDL_Init(SDL_INIT_AUDIO) != 0)
 		{
 			Com_Printf( "FAILED (%s)\n", SDL_GetError( ) );
 			return qfalse;