Merge pull request #196 from yizhanglinux/loop-006-fix

loop/006: fix the test failure with Bash 5.3

Yi Zhang reported the failure and provided the fix. Bash 5.3 enhances job wait and notification capabilities, and it looks causing the failure. I built bash 5.3 and recreated the failure. Also confirmed the commit avoids the failure.

Author: kawasaki

tests/loop/006

@@ -56,8 +56,9 @@ test() {
 	# Discard KILLED messages from bash...
 	{
 		kill -9 $switch_pid
+		wait $switch_pid
 		kill -9 $set_pid
-		wait
+		wait $set_pid
 		sleep 1
 	} 2>/dev/null