Fix misleading comment

Commit 333d8fb688fcc9fc5d803dfd0d5f100ee701229b made the umount call
here non-lazy, but didn't update the comment. It's confused me once
too many, so I'm fixing it.

Bug: 235797869
Test: N/A
Change-Id: I46f5d281b9c2ec909a572ffc7b7c037a5267df00
1 file changed