Fix GD_CHARGESHOUT_BEATING check (#8564)

Add missing parentheses to ensure the player is in a guild and avoid a short circuit check.

Co-authored-by: Atemo <Atemo@users.noreply.github.com>

src/map/clif.cpp

@@ -12834,7 +12834,7 @@ void clif_parse_skill_toid( map_session_data* sd, uint16 skill_id, uint16 skill_
 	sd->skillitem = sd->skillitemlv = 0;
 
 	if( SKILL_CHK_GUILD(skill_id) ) {
-		if (sd->guild && sd->state.gmaster_flag || skill_id == GD_CHARGESHOUT_BEATING)
+		if (sd->guild != nullptr && (sd->state.gmaster_flag || skill_id == GD_CHARGESHOUT_BEATING))
 			skill_lv = guild_checkskill(sd->guild->guild, skill_id);
 		else
 			skill_lv = 0;