Revert "loop: Avoid updating block size under exclusive owner"

Revert commit ce8da5d1 which is commit
7e495382 upstream.

This reverts commit ce8da5d1 ("loop: Avoid updating block size under
exclusive owner") for the 6.6 kernel, because if the LTP ioctl_loop06 test is
run with this patch in place, the test will fail, it leaves the host unable to
kexec into the kernel again (hangs forever) and "losetup -a" will hang on
attempting to access the /dev/loopN device that the test has set up.

The patch doesn't need to be reverted from 6.12, as it works fine there.

Cc: stable@vger.kernel.org # 6.6.x
Signed-off-by: Eric Hagberg <ehagberg@janestreet.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>