rpi-update <branch> only compares branch name, not commit

[by]

As described in https://forums.raspberrypi.com/viewtopic.php?t=356801#p2138697, when running subsequent rpi-update <branch> (e.g., sudo rpi-update rpi-6.5.y), no new update/commit will be pulled in as /boot/.firmware_revision only contains the branch name (i.e., rpi-6.5.y), not the current commit.

Thank you! Michael