crypto: fix typo in unittest found by thakis's new compiler warning.

(Note: landing unreviewed because it's trivial, the weekend before Xmas
and I'll forget about it if I leave it until after the vacation.)

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@242277 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 242277