lib/libcrypt: another trivial style change

Normalize on hard tabs.

I didn't catch this before pushing the previous commit.

No functional changes intended.

MFC after: 2 weeks
MFC with: 8ef8da882ff475e3da3bde57d97593a68f7d97b2

(cherry picked from commit 61b15e6dfc963a0c67dbaeae7f4590674976111f)