Fix some more memory leaks + an invalid read.

`ProfMessage` was not completely initialized, fix this by using `calloc()`
for the allocation.

Signed-off-by: Steffen Jaeckel <s@jaeckel.eu>

src/command/cmd_ac.c

@@ -1647,6 +1647,7 @@ cmd_ac_uninit(void)
     autocomplete_free(plugins_unload_ac);
     autocomplete_free(plugins_reload_ac);
     autocomplete_free(script_show_ac);
+    g_hash_table_destroy(ac_funcs);
 }
 
 static void

src/otr/otr.c

@@ -169,6 +169,7 @@ otr_start_query(void)
 static void
 _otr_shutdown(void)
 {
+    g_hash_table_destroy(smp_initiators);
     if (jid) {
         free(jid);
         jid = NULL;

src/xmpp/blocking.c

@@ -57,9 +57,19 @@ static int _block_remove_result_handler(xmpp_stanza_t* const stanza, void* const
 static GList* blocked;
 static Autocomplete blocked_ac;
 
+static void
+_blocking_shutdown(void)
+{
+    if (blocked) {
+        g_list_free_full(blocked, free);
+    }
+    autocomplete_free(blocked_ac);
+}
+
 void
 blocking_request(void)
 {
+    prof_add_shutdown_routine(_blocking_shutdown);
     if (blocked) {
         g_list_free_full(blocked, free);
         blocked = NULL;

src/xmpp/bookmark.c

@@ -66,9 +66,19 @@ static int _bookmark_result_id_handler(xmpp_stanza_t* const stanza, void* const
 static void _bookmark_destroy(Bookmark* bookmark);
 static void _send_bookmarks(void);
 
+static void
+_bookmark_shutdown(void)
+{
+    if (bookmarks) {
+        g_hash_table_destroy(bookmarks);
+    }
+    autocomplete_free(bookmark_ac);
+}
+
 void
 bookmark_request(void)
 {
+    prof_add_shutdown_routine(_bookmark_shutdown);
     if (bookmarks) {
         g_hash_table_destroy(bookmarks);
     }

src/xmpp/capabilities.c

@@ -72,6 +72,7 @@ static EntityCapabilities* _caps_copy(EntityCapabilities* caps);
 static void
 _caps_close(void)
 {
+    caps_reset_ver();
     free_keyfile(&caps_prof_keyfile);
     cache = NULL;
     g_hash_table_destroy(jid_to_ver);

src/xmpp/message.c

@@ -347,19 +347,9 @@ message_handlers_init(void)
 ProfMessage*
 message_init(void)
 {
-    ProfMessage* message = malloc(sizeof(ProfMessage));
+    ProfMessage* message = calloc(1, sizeof(ProfMessage));
 
-    message->from_jid = NULL;
-    message->to_jid = NULL;
-    message->id = NULL;
-    message->originid = NULL;
-    message->stanzaid = NULL;
-    message->replace_id = NULL;
-    message->body = NULL;
-    message->encrypted = NULL;
-    message->plain = NULL;
     message->enc = PROF_MSG_ENC_NONE;
-    message->timestamp = NULL;
     message->trusted = true;
     message->type = PROF_MSG_TYPE_UNINITIALIZED;