* dwarf2read.c (lookup_signatured_type): Return NULL instead of 0.

gdb/ChangeLog

@@ -1,5 +1,7 @@
 2012-04-17  Doug Evans  <dje@google.com>
 
+	* dwarf2read.c (lookup_signatured_type): Return NULL instead of 0.
+
 	* dwarf2read.c: Whitespace fixes.
 	(lookup_signatured_type): Tweak comment.
 	(get_die_type_at_offset): Fix comment.

gdb/dwarf2read.c

@@ -3362,7 +3362,7 @@ lookup_signatured_type (ULONGEST sig)
     {
       complaint (&symfile_complaints,
 		 _("missing `.debug_types' section for DW_FORM_ref_sig8 die"));
-      return 0;
+      return NULL;
     }
 
   find_entry.signature = sig;