ash: only allow local variables in functions

Signed-off-by: Ron Yorston <rmy@pobox.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

shell/ash.c

@@ -8987,6 +8987,9 @@ localcmd(int argc UNUSED_PARAM, char **argv)
 {
 	char *name;
 
+	if (!funcnest)
+		ash_msg_and_raise_error("not in a function");
+
 	argv = argptr;
 	while ((name = *argv++) != NULL) {
 		mklocal(name);

shell/ash_test/ash-misc/local2.right

@@ -0,0 +1 @@
+./local2.tests: local: line 1: not in a function

shell/ash_test/ash-misc/local2.tests

@@ -0,0 +1 @@
+local x=1