windres: buffer overflow in bin_to_res_toolbar

[Alan Modra]

Commit 9e68cae4fdfb broke the check I added in commit 4846e543de95.
Add missing "return NULL".

diff --git a/binutils/resbin.c b/binutils/resbin.c
index 1698e144d50..65bdb3499e2 100644
--- a/binutils/resbin.c
+++ b/binutils/resbin.c
@@ -1460,7 +1460,10 @@ bin_to_res_toolbar (windres_bfd *wrbfd, const bfd_byte *data,
     it = (rc_toolbar_item *) res_alloc (sizeof (rc_toolbar_item));
     it->id.named = 0;
     if (length < 4)
-      toosmall (_("toolbar item"));
+      {
+	toosmall (_("toolbar item"));
+	return NULL;
+      }
     it->id.u.id = (int) windres_get_32 (wrbfd, data, 4);
     it->prev = it->next = NULL;
     data += 4;

-- 
Alan Modra