Commit 7dd56b6cd9 ("boot/grub2/readme.txt: don't specify /dev/loop0")
changed the description of the loopback mounting to use losetup -f <img>,
but forgot to add the --show option, causing losetup to not print the
loopback device name.
Fix that by adding the --show option.
Signed-off-by: Cherniaev Andrei <dungeonlords789@naver.com>
[Peter: Reword commit message]
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
a480ae9ffe