Removed redundant assignment.

code/unix/sdl_glimp.c

@@ -625,7 +625,6 @@ static int GLW_SetMode( const char *drivername, int mode, qboolean fullscreen )
         tstencilbits = 0;
     }
 
-    sdlcolorbits = 4;
     if (tcolorbits == 24)
         sdlcolorbits = 8;