Fix stickychan joining inaccessable channels.

Channels that raise this error are unlikely to ever be unblocked,
either due to a jupe, or because the name contains illegal characters.

modules/stickychan.cpp

@@ -175,6 +175,26 @@ public:
 		return false;
 	}
 
+	EModRet OnRaw(CString& sLine) override {
+		CString sNumeric = sLine.Token(1);
+
+		if (sNumeric.Equals("479")) {
+			// ERR_BADCHANNAME (juped channels or illegal channel name - ircd hybrid)
+			// prevent the module from getting into an infinite loop of trying to join it.
+			// :irc.network.net 479 mynick #channel :Illegal channel name
+
+			CString sChannel = sLine.Token(3);
+			for (MCString::iterator it = BeginNV(); it != EndNV(); ++it) {
+				if (sChannel.Equals(it->first)) {
+					PutModule("Channel [" + sChannel + "] cannot be joined, it is an illegal channel name. Unsticking.");
+					OnUnstickCommand("unstick " + sChannel);
+					return CONTINUE;
+				}
+			}
+		}
+
+		return CONTINUE;
+	}
 };