Merge pull request #132 from Pan7/SDL_Init

SDL_Init zero check

code/sdl/sdl_input.c

@@ -437,7 +437,7 @@ 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;