NFSD: unregister filesystem in case genl_register_family() fails

With rpc_status netlink support, unregister of register_filesystem()
was missed in case of genl_register_family() fails.

Correcting it by making new label.

Fixes: bd9d6a3efa97 ("NFSD: add rpc_status netlink support")
Cc: [e-mail]
Signed-off-by: Maninder Singh <[e-mail]>
Reviewed-by: Jeff Layton <[e-mail]>
Signed-off-by: Chuck Lever <[e-mail]>

fs/nfsd/nfsctl.c

···
 		goto out_free_cld;
 	retval = register_filesystem(&nfsd_fs_type);
 	if (retval)
-		goto out_free_all;
+		goto out_free_nfsd4;
 	retval = genl_register_family(&nfsd_nl_family);
 	if (retval)
 		goto out_free_all;
···
 
 	return 0;
 out_free_all:
+	unregister_filesystem(&nfsd_fs_type);
+out_free_nfsd4:
 	nfsd4_destroy_laundry_wq();
 out_free_cld:
 	unregister_cld_notifier();