btrfs/299: update kernel commit hash and subject

btrfs/299: update kernel commit hash and subject

Test case btrfs/299 refers to a kernel patch with a subject of:

   "btrfs: fix logical_ino ioctl panic"

However when the patch was merged, the subject was renamed to:

   "btrfs: fix resolving backrefs for inline extent followed by prealloc"

So update the test with the correct subject and also add the commit's
hash from Linus' tree.

Signed-off-by: Filipe Manana <fdmanana@suse.com>
Reviewed-by: Anand Jain <anand.jain@oracle.com>
Reviewed-by: David Disseldorp <ddiss@suse.de>
Signed-off-by: Zorro Lang <zlang@kernel.org>