[patch ld]: Do some memory cleanup for def-file parsing

[Nick Clifton]

Hi Kai,

> ld/
> 2011-04-16  Kai Tietz
>
> 	* deffilep.y (def_pool_str): New type.
> 	(pool_strs): Local static.
> 	(def_pool_alloc): Local function.
> 	(def_pool_strdup): Likewise.
> 	(def_pool_free): Likewise.
> 	(opt_name): Replace xmalloc/xstrdup by
> 	def_pool_alloc/def_pool_strdup.
> 	(dot_name): Likewise.
> 	(anylang_id): Likewise.
> 	(def_lex): Likewise.
> 	(def_file_parse): Call def_pool_free on
> 	exit and cleanup directives elements.
> 	(def_file_add_directive): Call def_pool_free.

Approved - please apply.

But ...

+  e = (def_pool_str *) xmalloc (sizeof (def_pool_str) + sz);
+  if (!e)
+    return NULL;

This check is unnecessary - xmalloc() cannot return a NULL pointer.

Cheers
   Nick