[PATCH] avoid crash with objdump -P

[Nickolai Zeldovich]

This patch fixes the following crash due to a NULL pointer dereference on 
a Linux machine:

   % objdump -P foo /bin/ls

   /bin/ls:     file format elf64-x86-64
   Segmentation fault
   %

Nickolai.

--- binutils-2.23.51.0.8/binutils/objdump.c	2012-12-21 14:40:41.000000000 -0500
+++ binutils-2.23.51.0.8/binutils/objdump.c	2013-01-16 19:45:12.722118886 -0500
@@ -2651,7 +2651,7 @@
      if ((*desc)->filter (abfd))
        break;

-  if (desc == NULL)
+  if (*desc == NULL)
      {
        non_fatal (_("option -P/--private not supported by this file"));
        return;