Autotest loopback_latency: fix display of time_t values

The time_t value can be 64bit on 32bit systems, so assuming it fits into
a long won't work.  Cast it up to a big enough type for all systems.

BUG=chromium-os:36866
TEST=`emerge-x32-generic autotest-deps-audioloop` works now

Change-Id: Ic338a5b9ecd77b9222f087ae7cdbefe7771a18f7
Reviewed-on: https://gerrit.chromium.org/gerrit/42947
Reviewed-by: Dylan Reid <dgreid@chromium.org>
Commit-Queue: Mike Frysinger <vapier@chromium.org>
Tested-by: Mike Frysinger <vapier@chromium.org>
1 file changed