read.c assign_symbol: use notes obstack for dummy listing frag

	* read.c (assign_symbol): Use notes_calloc for dummy_frag.
diff --git a/gas/read.c b/gas/read.c
index 71bb30e..2f9a22a 100644
--- a/gas/read.c
+++ b/gas/read.c
@@ -3094,7 +3094,7 @@
       if (listing & LISTING_SYMBOLS)
 	{
 	  extern struct list_info_struct *listing_tail;
-	  fragS *dummy_frag = XCNEW (fragS);
+	  fragS *dummy_frag = notes_calloc (1, sizeof (*dummy_frag));
 	  dummy_frag->line = listing_tail;
 	  dummy_frag->fr_symbol = symbolP;
 	  symbol_set_frag (symbolP, dummy_frag);