UPSTREAM: USB: cdc-wdm: cleanup error codes

UPSTREAM: USB: cdc-wdm: cleanup error codes

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The internal error codes returned in the write() code
path cannot be simply passed on to user space.

Signed-off-by: Oliver Neukum <oneukum@suse.de>
Tested-by: Bjørn Mork <bjorn@mork.no>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
(cherry picked from commit 12a98b2bd8050b3cf28b50da612c484cdf174368)

Change-Id: Icec86cb9dc6a2011059024b7688feb5fc10f62f6
Signed-off-by: Ben Chan <benchan@chromium.org>
Reviewed-on: https://gerrit.chromium.org/gerrit/35153
Reviewed-by: Olof Johansson <olofj@chromium.org>