selinux: remove unnecessary pointer reassignment

(cherry pick from commit 83d4a806ae46397f606de7376b831524bd3a21e5)

Commit f01e1af4 ("selinux: don't pass in NULL avd to avc_has_perm_noaudit")
made this pointer reassignment unnecessary. Avd should continue to reference
the stack-based copy.

Signed-off-by: Jeff Vander Stoep <jeffv@google.com>
Acked-by: Stephen Smalley <sds@tycho.nsa.gov>
[PM: tweaked subject line]
Signed-off-by: Paul Moore <pmoore@redhat.com>
Bug: 22846070
Change-Id: I8fcba45a5acc4de862bd5b3f07bf4980f67133c4
Git-commit: b1b3844449d596e5f25f591d89611c7e57d32610
Git-repo: https://android.googlesource.com/kernel/common/


Signed-off-by: David Ng <dave@codeaurora.org>