Use mock_ptr_type() to silence compiler warnings

Unit tests on 32-bit architectures were failing due to
"cast to pointer from integer of different size" warnings.
mock_ptr_type silences those by first casting to uintptr_t.

tests/unittests/config/stub_accounts.c

@@ -36,13 +36,13 @@ int  accounts_remove(const char *jid)
 
 gchar** accounts_get_list(void)
 {
-    return (gchar **)mock();
+    return mock_ptr_type(gchar **);
 }
 
 ProfAccount* accounts_get_account(const char * const name)
 {
     check_expected(name);
-    return (ProfAccount*)mock();
+    return mock_ptr_type(ProfAccount*);
 }
 
 gboolean accounts_enable(const char * const name)

tests/unittests/otr/stub_otr.c

@@ -31,12 +31,12 @@ void otr_shutdown(void) {}
 
 char* otr_libotr_version(void)
 {
-    return (char*)mock();
+    return mock_ptr_type(char*);
 }
 
 char* otr_start_query(void)
 {
-    return (char*)mock();
+    return mock_ptr_type(char*);
 }
 
 void otr_poll(void) {}
@@ -86,13 +86,13 @@ void otr_end_session(const char * const recipient) {}
 
 char * otr_get_my_fingerprint(void)
 {
-    return (char *)mock();
+    return mock_ptr_type(char *);
 }
 
 char * otr_get_their_fingerprint(const char * const recipient)
 {
     check_expected(recipient);
-    return (char *)mock();
+    return mock_ptr_type(char *);
 }
 
 char * otr_encrypt_message(const char * const to, const char * const message)

tests/unittests/ui/stub_ui.c

@@ -483,7 +483,7 @@ void occupantswin_occupants_all(void) {}
 // window interface
 ProfWin* win_create_console(void)
 {
-    return (ProfWin*)mock();
+    return mock_ptr_type(ProfWin*);
 }
 ProfWin* win_create_xmlconsole(void)
 {
@@ -491,7 +491,7 @@ ProfWin* win_create_xmlconsole(void)
 }
 ProfWin* win_create_chat(const char * const barejid)
 {
-    return (ProfWin*)mock();
+    return mock_ptr_type(ProfWin*);
 }
 ProfWin* win_create_muc(const char * const roomjid)
 {

tests/unittests/xmpp/stub_xmpp.c

@@ -31,7 +31,7 @@ void session_shutdown(void) {}
 void session_process_events(void) {}
 const char * connection_get_fulljid(void)
 {
-    return (char *)mock();
+    return mock_ptr_type(char *);
 }
 
 const char * connection_get_domain(void)
@@ -65,12 +65,12 @@ jabber_conn_status_t connection_get_status(void)
 
 char* connection_get_presence_msg(void)
 {
-    return (char*)mock();
+    return mock_ptr_type(char*);
 }
 
 char* session_get_account_name(void)
 {
-    return (char*)mock();
+    return mock_ptr_type(char*);
 }
 
 GList * session_get_available_resources(void)
@@ -254,7 +254,7 @@ gboolean bookmark_join(const char *jid)
 
 GList * bookmark_get_list(void)
 {
-    return (GList *)mock();
+    return mock_ptr_type(GList *);
 }
 
 char * bookmark_find(const char * const search_str, gboolean previous)