git: 8d680381c89d - main - jail: tests: cosmetic-ish improvements

The branch main has been updated by kevans:

URL: https://cgit.FreeBSD.org/src/commit/?id=8d680381c89d8a8d1c0519a7eaa14ba41724b930

commit 8d680381c89d8a8d1c0519a7eaa14ba41724b930
Author:     Kyle Evans <kevans@FreeBSD.org>
AuthorDate: 2026-04-23 02:59:21 +0000
Commit:     Kyle Evans <kevans@FreeBSD.org>
CommitDate: 2026-04-23 03:02:38 +0000

    jail: tests: cosmetic-ish improvements
    
    The new version of incrementing `jid` is a little cleaner and harder to
    mess up, and also fix a nwlin omission while we're here.
    
    These comments were dropped on D51502; ngie takes a co-author credit
    so that they're not blamed for the commit message, but I can't claim
    that I tweaked their suggestions.
    
    Co-authored-by: ngie
---
 usr.sbin/jail/tests/jail_basic_test.sh | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/usr.sbin/jail/tests/jail_basic_test.sh b/usr.sbin/jail/tests/jail_basic_test.sh
index c781eed78756..cb50a94a45e8 100755
--- a/usr.sbin/jail/tests/jail_basic_test.sh
+++ b/usr.sbin/jail/tests/jail_basic_test.sh
@@ -186,11 +186,12 @@ find_unused_jid()
 			atf_skip "System has too many jail, cannot find free slot"
 		fi
 
-		jid=$((jid + 1))
+		: $(( jid += 1 ))
 	done
 
 	echo "$jid" | tee -a jails.lst
 }
+
 clean_jails()
 {
 	if [ ! -s jails.lst ]; then