Fix cut and past error in ast_call_forward().

(issue ASTERISK-18836)
........

Merged revisions 348401 from http://svn.asterisk.org/svn/asterisk/branches/1.8


git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/10@348405 65c4cc65-6c06-0410-ace0-fbb531ad65f3

main/channel.c

@@ -5437,7 +5437,7 @@ struct ast_channel *ast_call_forward(struct ast_channel *caller, struct ast_chan
 		if (oh->account) {
 			ast_channel_lock(new);
 			ast_cdr_setaccount(new, oh->account);
-			ast_channel_lock(new);
+			ast_channel_unlock(new);
 		}
 	} else if (caller) { /* no outgoing helper so use caller if avaliable */
 		ast_channel_update_redirecting(caller, apr, NULL);