Better detection of correctly-null-terminated body text

CID 229603 
14 jobs for dailybuild_linux-x64 in 9 minutes and 38 seconds (queued for 12 seconds)
Status Job ID Name Coverage
  Build
passed #32322
FreeBSD
jsdoor-freebsd

00:04:09

passed #32323
Linux
jsdoor-linux

00:06:42

passed #32325
FreeBSD
jsdoor-windows

00:01:54

passed #32317
FreeBSD
sbbs-freebsd

00:05:41

passed #32312
Linux
sbbs-linux

00:09:34

passed #32315
Windows
sbbs-windows

00:05:31

passed #32324
FreeBSD
sexpots-freebsd

00:00:11

passed #32313
Linux
sexpots-linux

00:00:22

passed #32316
Windows
sexpots-windows

00:00:25

passed #32320
FreeBSD
syncdraw-freebsd

00:00:24

passed #32321
Linux
syncdraw-linux

00:01:01

passed #32318
FreeBSD
syncterm-freebsd

00:01:02

passed #32314
Linux
syncterm-linux

00:02:43

passed #32319
FreeBSD
syncterm-windows

00:01:44