irc: check that pointers received in arguments are not NULL in "free" functions

Functions:
- irc_channel_nick_speaking_time_free
- irc_ignore_free
- irc_notify_free
- irc_raw_message_free
- irc_server_outqueue_free

src/plugins/irc/irc-channel.c

@@ -891,6 +891,9 @@ void
 irc_channel_nick_speaking_time_free (struct t_irc_channel *channel,
                                      struct t_irc_channel_speaking *nick_speaking)
 {
+    if (!channel || !nick_speaking)
+        return;
+
     /* free data */
     if (nick_speaking->nick)
         free (nick_speaking->nick);

src/plugins/irc/irc-ignore.c

@@ -251,6 +251,9 @@ irc_ignore_free (struct t_irc_ignore *ignore)
 {
     struct t_irc_ignore *ptr_ignore;
 
+    if (!ignore)
+        return;
+
     (void) weechat_hook_signal_send ("irc_ignore_removing",
                                      WEECHAT_HOOK_SIGNAL_POINTER, ignore);
 

src/plugins/irc/irc-notify.c

@@ -434,6 +434,9 @@ void
 irc_notify_free (struct t_irc_server *server, struct t_irc_notify *notify,
                  int remove_monitor)
 {
+    if (!server || !notify)
+        return;
+
     (void) weechat_hook_signal_send ("irc_notify_removing",
                                      WEECHAT_HOOK_SIGNAL_POINTER, notify);
 

src/plugins/irc/irc-raw.c

@@ -119,6 +119,9 @@ irc_raw_message_free (struct t_irc_raw_message *raw_message)
 {
     struct t_irc_raw_message *new_raw_messages;
 
+    if (!raw_message)
+        return;
+
     /* remove message from raw messages list */
     if (last_irc_raw_message == raw_message)
         last_irc_raw_message = raw_message->prev_message;

src/plugins/irc/irc-server.c

@@ -1512,6 +1512,9 @@ irc_server_outqueue_free (struct t_irc_server *server,
 {
     struct t_irc_outqueue *new_outqueue;
 
+    if (!server || !outqueue)
+        return;
+
     /* remove outqueue message */
     if (server->last_outqueue[priority] == outqueue)
         server->last_outqueue[priority] = outqueue->prev_outqueue;