Staging: android: timed_output.c: use kstrtoint() instead of sscanf()

This patch makes checkpatch.pl happy by fixing the following warning:

WARNING: Prefer kstrto<type> to single variable sscanf

Signed-off-by: Murilo Opsfelder Araujo <mopsfelder@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>