knfsd: cache unregistration needn't return error

There's really nothing much the caller can do if cache unregistration
fails.  And indeed, all any caller does in this case is print an error
and continue.  So just return void and move the printk's inside
cache_unregister.

Acked-by: NeilBrown <neilb@suse.de>
Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
diff --git a/net/sunrpc/auth_gss/svcauth_gss.c b/net/sunrpc/auth_gss/svcauth_gss.c
index 73940df..d329a12 100644
--- a/net/sunrpc/auth_gss/svcauth_gss.c
+++ b/net/sunrpc/auth_gss/svcauth_gss.c
@@ -1396,9 +1396,7 @@
 void
 gss_svc_shutdown(void)
 {
-	if (cache_unregister(&rsc_cache))
-		printk(KERN_ERR "auth_rpcgss: failed to unregister rsc cache\n");
-	if (cache_unregister(&rsi_cache))
-		printk(KERN_ERR "auth_rpcgss: failed to unregister rsi cache\n");
+	cache_unregister(&rsc_cache);
+	cache_unregister(&rsi_cache);
 	svc_auth_unregister(RPC_AUTH_GSS);
 }