BugLink: https://bugs.launchpad.net/bugs/1878232

commit 41f469ca upstream.

wait_for_completion_timeout_interruptible returns long not unsigned long
so dma_time, which is used exclusively here, is changed to long.

Fixes: 1b66e94e ("mmc: moxart: Add MOXA ART SD/MMC driver")
Signed-off-by: Nicholas Mc Guire <hofrat@osadl.org>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Ian May <ian.may@canonical.com>
Signed-off-by: Kleber Sacilotto de Souza <kleber.souza@canonical.com>