asan: segv in _bfd_archive_close_and_cleanup

[Alan Modra]

Uninitialised arelt_data->parent_cache led to this segv.

	* pdb.c (pdb_get_elt_at_index): Clear arelt_data.

diff --git a/bfd/pdb.c b/bfd/pdb.c
index 14e1049d03c..5d72797c298 100644
--- a/bfd/pdb.c
+++ b/bfd/pdb.c
@@ -193,7 +193,7 @@ pdb_get_elt_at_index (bfd *abfd, symindex sym_index)
     goto fail;
 
   file->arelt_data =
-    (struct areltdata *) bfd_malloc (sizeof (struct areltdata));
+    (struct areltdata *) bfd_zmalloc (sizeof (struct areltdata));
 
   if (!file->arelt_data)
     goto fail;

-- 
Alan Modra
Australia Development Lab, IBM