staging: frontier: switch to strict_strtoul in tranzport.c

This is a patch to tranzport.c that changes a use of simple_strtoul to
strict_strtoul at the suggestion of checkpatch.pl

Signed-off-by: Eli Lindsey <eli@siliconsprawl.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>