Don't use uninitialized ps from BotAI_GetClientState

If BotAI_GetPlayerState returns qfalse, ps is untouched and in
some cases means uninitialized. So don't use it if not valid.

code/game/ai_dmq3.c

@@ -206,7 +206,10 @@ qboolean EntityIsDead(aas_entityinfo_t *entinfo) {
 
 	if (entinfo->number >= 0 && entinfo->number < MAX_CLIENTS) {
 		//retrieve the current client state
-		BotAI_GetClientState( entinfo->number, &ps );
+		if (!BotAI_GetClientState(entinfo->number, &ps)) {
+			return qfalse;
+		}
+
 		if (ps.pm_type != PM_NORMAL) return qtrue;
 	}
 	return qfalse;