NFSD: Fix warnings when NFSD_DEBUG is not defined

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
diff --git a/fs/nfsd/nfs4proc.c b/fs/nfsd/nfs4proc.c
index abe808a..3f7dbc4 100644
--- a/fs/nfsd/nfs4proc.c
+++ b/fs/nfsd/nfs4proc.c
@@ -1053,7 +1053,9 @@
 
 static struct nfsd4_operation nfsd4_ops[];
 
+#ifdef NFSD_DEBUG
 static const char *nfsd4_op_name(unsigned opnum);
+#endif
 
 /*
  * Enforce NFSv4.1 COMPOUND ordering rules:
@@ -1714,12 +1716,14 @@
 	},
 };
 
+#ifdef NFSD_DEBUG
 static const char *nfsd4_op_name(unsigned opnum)
 {
 	if (opnum < ARRAY_SIZE(nfsd4_ops))
 		return nfsd4_ops[opnum].op_name;
 	return "unknown_operation";
 }
+#endif
 
 #define nfsd4_voidres			nfsd4_voidargs
 struct nfsd4_voidargs { int dummy; };