shell: tweak getopts tests, no code changes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
diff --git a/shell/hush_test/hush-getopts/getopt_positional.tests b/shell/hush_test/hush-getopts/getopt_positional.tests
index ddf0633..20716bb 100755
--- a/shell/hush_test/hush-getopts/getopt_positional.tests
+++ b/shell/hush_test/hush-getopts/getopt_positional.tests
@@ -1,3 +1,5 @@
+(
+
 set -- -q -w -e r -t -y
 echo "*** no OPTIND, optstring:'we' args:$*"
 var=QWERTY
@@ -5,3 +7,7 @@
 	echo "var:'$var' OPTIND:$OPTIND"
 done
 echo "exited: var:'$var' OPTIND:$OPTIND"
+
+) 2>&1 \
+| sed	-e 's/ unrecognized option: / invalid option -- /' \
+	-e 's/ illegal option -- / invalid option -- /' \