add and use Channel_IsModeless()

avoid "name[0] == '+'" where possible, having Channel_IsModeless()
makes things much more obvious.

src/ngircd/channel.h

@@ -132,7 +132,7 @@ GLOBAL bool Channel_CheckKey PARAMS((CHANNEL *Chan, CLIENT *Client,
 				     const char *Key));
 
 #define Channel_IsLocal(c) (Channel_Name(c)[0] == '&')
-
+#define Channel_IsModeless(c) (Channel_Name(c)[0] == '+')
 
 #endif
 

src/ngircd/irc-channel.c

@@ -303,7 +303,7 @@ IRC_JOIN( CLIENT *Client, REQUEST *Req )
 		if (!chan) { /* channel is new; it has been created above */
 			chan = Channel_Search(channame);
 			assert(chan != NULL);
-			if (*channame == '+') { /* modeless channel... */
+			if (Channel_IsModeless(chan)) {
 				Channel_ModeAdd(chan, 't'); /* /TOPIC not allowed */
 				Channel_ModeAdd(chan, 'n'); /* no external msgs */
 			}

src/ngircd/irc-mode.c

@@ -290,8 +290,7 @@ Channel_Mode(CLIENT *Client, REQUEST *Req, CLIENT *Origin, CHANNEL *Channel)
 	long l;
 	size_t len;
 
-	/* Are modes allowed on channel? */
-	if (Channel_Name(Channel)[0] == '+')
+	if (Channel_IsModeless(Channel))
 		return IRC_WriteStrClient(Client, ERR_NOCHANMODES_MSG,
 				Client_ID(Client), Channel_Name(Channel));