nfs: fix handling of invalid mount options in nfs_remount
nfs_parse_mount_options returns 0 on error, not -errno. Reported-by: NKarel Zak <kzak@redhat.com> Signed-off-by: NJeff Layton <jlayton@redhat.com> Signed-off-by: NTrond Myklebust <Trond.Myklebust@netapp.com>
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