nfsd: Fix memleak in svc_export_put

In func svc_export_parse, the uuid which used kmemdup to alloc will be
changed in func export_update.So the later kfree don't free this memory.
And it can't be free in func svc_export_parse because other place still
used.So put this operation in func svc_export_put.

Signed-off-by: Jianpeng Ma <majianpeng@gmail.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>

fs/nfsd/export.c

@@ -315,6 +315,7 @@ static void svc_export_put(struct kref *ref)
 	path_put(&exp->ex_path);
 	auth_domain_put(exp->ex_client);
 	nfsd4_fslocs_free(&exp->ex_fslocs);
+	kfree(exp->ex_uuid);
 	kfree(exp);
 }