Fix two minor issues outlined in the PR#222

irc-cap.c has now a licence header.
A minor style fix in misc.c

src/core/misc.c

@@ -215,7 +215,7 @@ void gslist_free_full (GSList *list, GDestroyNotify free_func)
 {
 	GSList *tmp;
 
-	if (!list)
+	if (list == NULL)
 		return;
 
 	for (tmp = list; tmp != NULL; tmp = tmp->next)

src/irc/core/irc-cap.c

@@ -1,3 +1,22 @@
+/*  irc-cap.c : irssi
+
+    Copyright (C) 2015 The Lemon Man
+
+    This program is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 2 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License along
+    with this program; if not, write to the Free Software Foundation, Inc.,
+    51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+*/
+
 #include "module.h"
 #include "signals.h"
 #include "misc.h"