remove debug printf left behind in previous commit

src/switch_core_sqldb.c

@@ -958,7 +958,6 @@ static void core_event_handler(switch_event_t *event)
 	case SWITCH_EVENT_CHANNEL_DESTROY:
 		sql = switch_mprintf("delete from channels where uuid='%q' and hostname='%q'",
 							 switch_event_get_header_nil(event, "unique-id"), switch_core_get_variable("hostname"));
-		printf("%s\n", sql);
 		break;
 	case SWITCH_EVENT_CHANNEL_UUID:
 		{