Don't bother running the can_send() hook if we're not on the channel.

src/channel.c

@@ -850,6 +850,8 @@ can_send(struct Channel *chptr, struct Client *source_p, struct membership *mspt
 				moduledata.approved = CAN_SEND_NO;
 			else
 				moduledata.approved = CAN_SEND_NONOP;
+
+			return moduledata.approved;
 		}
 	}