UPSTREAM: mwifiex: report error to MMC core if we cannot suspend

UPSTREAM: mwifiex: report error to MMC core if we cannot suspend

When host_sleep_config command fails we should return error to
MMC core to indicate the failure for our device.

The misspelled variable is also removed as it's redundant.

Cc: "3.0+" <stable@vger.kernel.org>
Signed-off-by: Bing Zhao <bzhao@marvell.com>
Signed-off-by: Paul Stewart <pstew@chromium.org>
BUG=chrome-os-partner:15129
TEST=Boot, associate, speed test, suspend, resume

Change-Id: I9d53425b29050274840030e63f95969601ee622f
Reviewed-on: https://gerrit.chromium.org/gerrit/38285
Reviewed-by: Bing Zhao <bzhao@marvell.com>
Reviewed-by: mukesh agrawal <quiche@chromium.org>
Commit-Ready: Paul Stewart <pstew@chromium.org>
Tested-by: Paul Stewart <pstew@chromium.org>