Description: btrfs: fix root ref counts in error handling in btrfs_get_root_ref
References:
 https://bugzilla.redhat.com/show_bug.cgi?id=2219271
 https://patchwork.kernel.org/project/linux-btrfs/patch/20220324134454.15192-1-baijiaju1990@gmail.com/
Notes:
 carnil> Commit fixes bc44d7c4b2b1 ("btrfs: push btrfs_grab_fs_root into
 carnil> btrfs_get_fs_root") in 5.7-rc1.
Bugs:
upstream: released (5.18-rc3) [168a2f776b9762f4021421008512dd7ab7474df1]
6.1-upstream-stable: N/A "Fixed before branching point"
5.10-upstream-stable: released (5.10.112) [1d2eda18f6ffbd9902594469c6e1a055014eb2ac]
4.19-upstream-stable: N/A "Vulnerable code not present"
sid: released (5.17.6-1)
6.1-bookworm-security: N/A "Fixed before branching point"
5.10-bullseye-security: released (5.10.113-1)
4.19-buster-security: N/A "Vulnerable code not present"