[PATCH v2] btrfs/315: update filter to match mount cmd

[An Long <lan@suse.com>]

Mount error info changed since util-linux v2.40
(91ea38e libmount: report failed syscall name).
So update _filter_mount_error() to match it.

Signed-off-by: An Long <lan@suse.com>
---
 tests/btrfs/315 | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/tests/btrfs/315 b/tests/btrfs/315
index 5852afad..5101a9a3 100755
--- a/tests/btrfs/315
+++ b/tests/btrfs/315
@@ -39,7 +39,11 @@ _filter_mount_error()
        # mount: <mnt-point>: fsconfig system call failed: File exists.
        # dmesg(1) may have more information after failed mount system
call.

-       grep -v dmesg | _filter_test_dir | sed -e
"s/mount(2)\|fsconfig//g"
+       # For util-linux v2.4 and later:
+       # mount: <mountpoint>: mount system call failed: File exists.
+
+       grep -v dmesg | _filter_test_dir | sed -e
"s/mount(2)\|fsconfig//g" | \
+        sed -E "s/mount( system call failed:)/\1/"
 }

 seed_device_must_fail()
-- 
2.43.0