PATCH: Small fix in gnumach

[gfleury]

Hello,
http://git.savannah.gnu.org/cgit/hurd/gnumach.git/tree/vm/vm_object.c#n1371

if the previous call vm_object_enter return VM_OBJECT_NULL in new_object
the new_object->shadow dereference of NULL will cause a bug.

attached file fix this. Fix the indentation if it is not correct.

0001-fix-possible-dereference-of-NULL.patch
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