commit 86bbd7422ae6a33735df6846fd685e46686da714 upstream.

The filehandle has a length which is defined as a 32-bit
"unsigned integer".  Change sign of the length appropriately.
Signed-off-by: NFrank Sorenson <sorenson@redhat.com>
Signed-off-by: NTrond Myklebust <trond.myklebust@hammerspace.com>
Signed-off-by: NJoseph Qi <joseph.qi@linux.alibaba.com>
Reviewed-by: NXiaoguang Wang <xiaoguang.wang@linux.alibaba.com>