nfsd4: typo logical vs bitwise negate for want_mask

Signed-off-by: NBenny Halevy <bhalevy@tonian.com>
Signed-off-by: NJ. Bruce Fields <bfields@redhat.com>

fs/nfsd/nfs4xdr.c

@@ -671,7 +671,7 @@ static __be32 nfsd4_decode_share_access(struct nfsd4_compoundargs *argp, u32 *x)
 	default:
 		return nfserr_bad_xdr;
 	}
-	w &= !NFS4_SHARE_WANT_MASK;
+	w &= ~NFS4_SHARE_WANT_MASK;
 	if (!w)
 		return nfs_ok;
 	switch (w) {