objdump segfault after symbol table error

This memcpy segfaults if symcount is -1 (=> syms is NULL).
      memcpy (sorted_syms, symcount ? syms : dynsyms,
	      sorted_symcount * sizeof (asymbol *));

	* objdump.c (slurp_symtab): Don't leave symcount as -1 after
	an error.
	(slurp_dynamic_symtab): Likewise for dynsymcount.

binutils/objdump.c

@@ -1015,6 +1015,7 @@ slurp_symtab (bfd *abfd)
       my_bfd_nonfatal (bfd_get_filename (abfd));
       free (sy);
       sy = NULL;
+      symcount = 0;
     }
   return sy;
 }
@@ -1048,6 +1049,7 @@ slurp_dynamic_symtab (bfd *abfd)
       my_bfd_nonfatal (bfd_get_filename (abfd));
       free (sy);
       sy = NULL;
+      dynsymcount = 0;
     }
   return sy;
 }