Fix CID 33235: Argument cannot be negative

14 jobs for master in 14 minutes (queued for 20 seconds)
Status Job ID Name Coverage
  Build
passed #33114
FreeBSD
jsdoor-freebsd

00:04:02

passed #33115
Linux
jsdoor-linux

00:07:29

passed #33117
FreeBSD
jsdoor-windows

00:01:53

passed #33109
FreeBSD
sbbs-freebsd

00:05:38

passed #33104
Linux
sbbs-linux

00:12:50

passed #33107
Windows
sbbs-windows

00:04:51

passed #33116
FreeBSD
sexpots-freebsd

00:00:15

passed #33105
Linux
sexpots-linux

00:00:15

passed #33108
Windows
sexpots-windows

00:00:22

passed #33112
FreeBSD
syncdraw-freebsd

00:00:25

passed #33113
Linux
syncdraw-linux

00:01:04

passed #33110
FreeBSD
syncterm-freebsd

00:01:00

passed #33106
Linux
syncterm-linux

00:03:27

passed #33111
FreeBSD
syncterm-windows

00:01:44