[release-branch.go1.24] runtime: add missing unlock in sysReserveAlignedSbrk
sysReserveAlignedSbrk locks memlock at entry, but it is not
unlocked at one of the return path. Add the missing unlock.
Updates #74339.
Fixes #74346.
Change-Id: Ib641bc348aca41494ec410e2c4eb9857f3362484
Reviewed-on: https://go-review.googlesource.com/c/go/+/683295
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: David Chase <drchase@google.com>
Reviewed-by: Michael Knyszek <mknyszek@google.com>
(cherry picked from commit
456a90aa1618a6c3aa49ecba46969128e2bfa26f)
Reviewed-on: https://go-review.googlesource.com/c/go/+/684016
Auto-Submit: Dmitri Shuralyov <dmitshur@google.com>