ANDROID: blk-crypto: fix checkpatch warning

Fix a checkpatch warning that I fixed when applying
ANDROID-block-add-hardware-wrapped-key-support.patch to android12-5.4
(http://aosp/1394283

).  This gets android-mainline in sync.

This should be folded into
ANDROID-block-add-hardware-wrapped-key-support.patch.

Bug: 160883801
Change-Id: I1eaa5eaa97dc432fb70106bfd5b59eaf899808fe
Signed-off-by: Eric Biggers <ebiggers@google.com>