vbnv: Initialize variables that may be checked later

Set the buffer variables to NULL so that if flashrom fails then they
are not attempted to be freed.

TEST=remove flashrom binary, run 'mosys nvram vboot read'

Change-Id: I069d1874324fd9746d692cadfaee367e3890ae47
Signed-off-by: Duncan Laurie <dlaurie@google.com>
Reviewed-on: https://chromium-review.googlesource.com/481983
Reviewed-by: David Hendricks <dhendrix@chromium.org>
Reviewed-by: Furquan Shaikh <furquan@chromium.org>
1 file changed