upstream: Shell syntax fix. From ren mingshuai vi github PR#369.

OpenBSD-Regress-ID: 6696b2eeefe128099fc3d7ea9f23252cc35156f9

regress/yes-head.sh

@@ -1,4 +1,4 @@
-#	$OpenBSD: yes-head.sh,v 1.6 2017/04/30 23:34:55 djm Exp $
+#	$OpenBSD: yes-head.sh,v 1.7 2023/01/14 10:05:54 dtucker Exp $
 #	Placed in the Public Domain.
 
 tid="yes pipe head"
@@ -6,7 +6,7 @@ tid="yes pipe head"
 lines=`${SSH} -F $OBJ/ssh_proxy thishost 'sh -c "while true;do echo yes;done | _POSIX2_VERSION=199209 head -2000"' | (sleep 3 ; wc -l)`
 if [ $? -ne 0 ]; then
 	fail "yes|head test failed"
-	lines = 0;
++	lines=0
 fi
 if [ $lines -ne 2000 ]; then
 	fail "yes|head returns $lines lines instead of 2000"