[PATCH] fstests: btrfs/080: fix the stray '\'

[Qu Wenruo <wqu@suse.com>]

[BUG]
The latest grep will report stray '\', causing golden output mismatch
for btrfs/080:

btrfs/080       - output mismatch (see ~/xfstests-dev/results//btrfs/080.out.bad)
    --- tests/btrfs/080.out	2022-11-24 19:53:53.137469203 +0800
    +++ ~/xfstests-dev/results//btrfs/080.out.bad	2022-12-09 11:41:46.194597311 +0800
    @@ -1,2 +1,3 @@
     QA output created by 080
    +grep: warning: stray \ before -
     Silence is golden
    ...
    (Run 'diff -u ~/xfstests-dev/tests/btrfs/080.out ~/xfstests-dev/results//btrfs/080.out.bad'  to see the entire diff)

[CAUSE]
Even for regrex of grep, '-' doesn't need special escape, thus
"\bno\-holes\b" indeed has an unnecessary '\' before '-'.

[FIX]
Just remove the stray '\'.

Signed-off-by: Qu Wenruo <wqu@suse.com>
---
 tests/btrfs/080 | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tests/btrfs/080 b/tests/btrfs/080
index 45f5ad19..ac9d9b64 100755
--- a/tests/btrfs/080
+++ b/tests/btrfs/080
@@ -76,7 +76,7 @@ workout()
 # created fs doesn't get that feature enabled. With it enabled, the below fsck
 # call wouldn't fail. This feature hasn't been enabled by default since it was
 # introduced, but be safe and explicitly disable it.
-_scratch_mkfs -O list-all 2>&1 | grep -q '\bno\-holes\b'
+_scratch_mkfs -O list-all 2>&1 | grep -q '\bno-holes\b'
 if [ $? -eq 0 ]; then
 	mkfs_options="-O ^no-holes"
 fi
-- 
2.38.0