Fix GCC warning

Author: andrikpowell

prboom2/src/r_main.c

@@ -931,11 +931,12 @@ static void R_SetupFrame (player_t *player)
   int i, cm;
 
   int FocalTangent = finetangent[FINEANGLES/4 + FieldOfView/2];
+  int extra_brightness = dsda_IntConfig(dsda_config_extra_level_brightness);
 
   viewplayer = player;
 
   extralight = player->extralight;
-  int extra_brightness = dsda_IntConfig(dsda_config_extra_level_brightness);
+
   if (extra_brightness < 0 || extra_brightness > 4) {
     extra_brightness = 0;
   }