tests: update unit tests

Not really a best practise. They should have been run before each commit
and updated accordingly. Next time..

tests/unittests/log/stub_log.c

@@ -60,10 +60,10 @@ log_msg(log_level_t level, const char* const area, const char* const msg)
 {
 }
 
-const char*
+const gchar*
 get_log_file_location(void)
 {
-    return mock_ptr_type(char*);
+    return mock_ptr_type(gchar*);
 }
 
 int