ANDROID: fscrypt: fix checkpatch warning

Fix a checkpatch warning that I fixed when applying
ANDROID-fscrypt-add-support-for-hardware-wrapped-keys.patch to
android12-5.4 (http://aosp/1394286

).  This gets android-mainline in
sync.

This should be folded into
ANDROID-fscrypt-add-support-for-hardware-wrapped-keys.patch.

Bug: 160883801
Change-Id: Id615560edf4405a5b748cf402565d8f157298d3b
Signed-off-by: Eric Biggers <ebiggers@google.com>