NFSv4.2: Ensure we always reset the result->count in decode_read_plus()

Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>

fs/nfs/nfs42xdr.c

@@ -1087,6 +1087,7 @@ static int decode_read_plus(struct xdr_stream *xdr, struct nfs_pgio_res *res)
 	if (unlikely(!p))
 		return -EIO;
 
+	res->count = 0;
 	eof = be32_to_cpup(p++);
 	segments = be32_to_cpup(p++);
 	if (segments == 0)