Make source cleah with cppcheck, except for mpc and sasl

src/fe-gtk/fkeys.c

@@ -1153,6 +1153,7 @@ key_load_kbs (char *filename)
 						 get_xdir ());
 	fe_message (ibuf, FE_MSG_ERROR);
 	free (ibuf);
+	free (kb);
 	return 5;
 }
 

src/fe-gtk/maingui.c

@@ -1646,7 +1646,8 @@ mg_create_tabmenu (session *sess, GdkEventButton *event, chan *ch)
 								mg_destroy_tab_cb, ch);
 	if (sess && tabmenu_list)
 		menu_create (menu, tabmenu_list, sess->channel, FALSE);
-	menu_add_plugin_items (menu, "\x4$TAB", sess->channel);
+	if (sess)
+		menu_add_plugin_items (menu, "\x4$TAB", sess->channel);
 
 	if (event->window)
 		gtk_menu_set_screen (GTK_MENU (menu), gdk_drawable_get_screen (event->window));