nfsd4: typo logical vs bitwise negate

This should be a bitwise negate here.  It silences a Sparse warning:
fs/nfsd/nfs4xdr.c:693:16: warning: dubious: x & !y

Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
diff --git a/fs/nfsd/nfs4xdr.c b/fs/nfsd/nfs4xdr.c
index 2cab33c..645a0a9 100644
--- a/fs/nfsd/nfs4xdr.c
+++ b/fs/nfsd/nfs4xdr.c
@@ -690,7 +690,7 @@
 	READ_BUF(4);
 	READ32(*x);
 	/* Note: unlinke access bits, deny bits may be zero. */
-	if (*x & !NFS4_SHARE_DENY_BOTH)
+	if (*x & ~NFS4_SHARE_DENY_BOTH)
 		return nfserr_bad_xdr;
 	return nfs_ok;
 xdr_error: