[patch] nto target: fix null pointer dereference

[Aleksandar Ristovski <aristovski@qnx.com>]

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Hello,

Simple patch to fix null pointer dereference. This should make qnx target operational and usable. 

Thanks,

Aleksandar Ristovski
QNX Software Systems

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2008-08-12  Aleksandar Ristovski  <aristovski@qnx.com>

	* nto-tdep.c (LM_ADDR): Make sure the address is valid before
	dereferencing.


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Index: gdb/nto-tdep.c
===================================================================
RCS file: /cvs/src/src/gdb/nto-tdep.c,v
retrieving revision 1.25
diff -u -p -r1.25 nto-tdep.c
--- gdb/nto-tdep.c	23 Jul 2008 13:36:00 -0000	1.25
+++ gdb/nto-tdep.c	12 Aug 2008 16:33:18 -0000
@@ -266,6 +266,8 @@ LM_ADDR (struct so_list *so)
 {
   struct link_map_offsets *lmo = nto_fetch_link_map_offsets ();
 
+  if (so->lm_info->lm == NULL)
+	return 0;
   return extract_typed_address (so->lm_info->lm + lmo->l_addr_offset,
                                 builtin_type_void_data_ptr);
 }