Fix a few warnings

code/game/g_items.c

@@ -348,6 +348,10 @@ RespawnItem
 ===============
 */
 void RespawnItem( gentity_t *ent ) {
+	if (!ent) {
+		return;
+	}
+
 	// randomly select from teamed entities
 	if (ent->team) {
 		gentity_t	*master;