hostmem-file: plug a small leak

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Message-Id: <1460566660-19241-1-git-send-email-marcandre.lureau@redhat.com>
Reviewed-by: Igor Mammedov <imammedo@redhat.com>
Signed-off-by: Markus Armbruster <armbru@redhat.com>

backends/hostmem-file.c

@@ -121,11 +121,19 @@ file_backend_instance_init(Object *o)
                             set_mem_path, NULL);
 }
 
+static void file_backend_instance_finalize(Object *o)
+{
+    HostMemoryBackendFile *fb = MEMORY_BACKEND_FILE(o);
+
+    g_free(fb->mem_path);
+}
+
 static const TypeInfo file_backend_info = {
     .name = TYPE_MEMORY_BACKEND_FILE,
     .parent = TYPE_MEMORY_BACKEND,
     .class_init = file_backend_class_init,
     .instance_init = file_backend_instance_init,
+    .instance_finalize = file_backend_instance_finalize,
     .instance_size = sizeof(HostMemoryBackendFile),
 };