[PATCH] generic/805: mask unmount failures on cleanup

["Darrick J. Wong" <djwong@kernel.org>]

From: Darrick J. Wong <djwong@kernel.org>

On (what's left of) my NFS-booted QA fleet I get test "failures" like
this:

 --- a/generic/805.out	2026-09-22 13:33:18.326820071 -0700
 +++ b/generic/805.out.bad	2026-10-14 18:58:34.438866321 -0700
 @@ -1,2 +1,4 @@
  QA output created by 805
  Silence is golden
 +umount.nfs: remote share not in 'host:dir' format
 +umount.nfs: /mnt/s: not mounted

This is caused by the _unmount call in _cleanup getting cranky about the
scratch mount not being mounted despite the -q flag.  I think this is
because umount(8) detects the underlying fs as NFS and delegates
entirely to umount.nfs, and that program whines.

So fix the test by redirecting the output.  We've already decided if the
test passes or not before we get to cleanup.

Signed-off-by: "Darrick J. Wong" <djwong@kernel.org>
Reviewed-by: Andrey Albershteyn <aalbersh@kernel.org>
---
 tests/generic/805 |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tests/generic/805 b/tests/generic/805
index 401829c4c6fcdf..fa454310137a29 100755
--- a/tests/generic/805
+++ b/tests/generic/805
@@ -25,7 +25,7 @@ _cleanup()
 {
 	xfs_freeze -u $SCRATCH_MNT 2>/dev/null
 	$DMSETUP_PROG resume $lvdev >> $seqres.full 2>&1
-	_unmount -q $SCRATCH_MNT
+	_unmount -q $SCRATCH_MNT &>> $seqres.full
 	_dmsetup_remove $node
 	cd /
 	rm -f $tmp.*