UPSTREAM: mmc-utils: Check for ext_csd_rev only once

BUG=None
TEST=Compile

Signed-off-by: Alexander Stein <alexander.stein@systec-electronic.com>
Signed-off-by: Chris Ball <chris@printf.net>
(cherry picked from commit 37c86e60c0442fef570b75cd81aeb1db4d0cbafd)
Signed-off-by: Gwendal Grignou <gwendal@chromium.org>

Change-Id: I56ed94384f1cb6f8ee366ddfbc0563eb4706ef65
Reviewed-on: https://chromium-review.googlesource.com/1114449
Commit-Ready: Gwendal Grignou <gwendal@chromium.org>
Tested-by: Gwendal Grignou <gwendal@chromium.org>
Reviewed-by: Julius Werner <jwerner@chromium.org>
1 file changed