tpm: fix GetCapability calls to use the correct pointer

The additions of ScopedTssMemory introduced a little weirdness
and the *cap meme was leftover work from an earlier version. However,
it is wrong.  This changes fixes that wrong-ness.

TEST=unittests pass; builds works
BUG=chromium-os:13129

Change-Id: Ie45e97af8a14a30dc8a8121950b88b105399dd48

R=gauravsh@chromium.org

Review URL: http://codereview.chromium.org/6731069
1 file changed