Only complete the SIP channel name once for 'sip show channel <channel>'

git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.4@114245 65c4cc65-6c06-0410-ace0-fbb531ad65f3

channels/chan_sip.c

@@ -10872,6 +10872,10 @@ static char *complete_sipch(const char *line, const char *word, int pos, int sta
 	char *c = NULL;
 	int wordlen = strlen(word);
 
+	if (pos != 3) {
+		return NULL;
+	}
+
 	ast_mutex_lock(&iflock);
 	for (cur = iflist; cur; cur = cur->next) {
 		if (!strncasecmp(word, cur->callid, wordlen) && ++which > state) {