nfsd4: allow nfs4 state startup to fail

The failure here is pretty unlikely, but we should handle it anyway.

Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
diff --git a/fs/nfsd/nfssvc.c b/fs/nfsd/nfssvc.c
index 4472449..fcc0010 100644
--- a/fs/nfsd/nfssvc.c
+++ b/fs/nfsd/nfssvc.c
@@ -411,7 +411,9 @@
 	error =	nfsd_racache_init(2*nrservs);
 	if (error<0)
 		goto out;
-	nfs4_state_start();
+	error = nfs4_state_start();
+	if (error)
+		goto out;
 
 	nfsd_reset_versions();