nfsd: cleanup nfsd module initialization cleanup

Handle the failure case here with something closer to the standard
kernel style.

Doesn't really matter for now, but I'd like to add a few more failure
cases, and then this'll help.
Acked-by: NeilBrown <neilb@suse.de>
Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>

fs/nfsd/nfsctl.c

@@ -694,7 +694,10 @@ static int __init init_nfsd(void)
 			entry->proc_fops =  &exports_operations;
 	}
 	retval = register_filesystem(&nfsd_fs_type);
-	if (retval) {
+	if (retval)
+		goto out_free_all;
+	return 0;
+out_free_all:
 	nfsd_idmap_shutdown();
 	nfsd_export_shutdown();
 	nfsd_cache_shutdown();
@@ -703,7 +706,6 @@ static int __init init_nfsd(void)
 	nfsd_stat_shutdown();
 	nfsd_lockd_shutdown();
 	nfsd4_free_slabs();
-	}
 	return retval;
 }