Fix mprotect bogus check.

[Dave Jones]

If we want to trap NULL vma's, we'd better be sure
that we don't dereference it first..

		Dave

--- linux-2.6.5/mm/mprotect.c~	2004-04-16 21:52:47.000000000 +0100
+++ linux-2.6.5/mm/mprotect.c	2004-04-16 21:53:12.000000000 +0100
@@ -114,10 +114,11 @@
 mprotect_attempt_merge(struct vm_area_struct *vma, struct vm_area_struct *prev,
 		unsigned long end, int newflags)
 {
-	struct mm_struct * mm = vma->vm_mm;
+	struct mm_struct * mm;
 
 	if (!prev || !vma)
 		return 0;
+	mm = vma->vm_mm;
 	if (prev->vm_end != vma->vm_start)
 		return 0;
 	if (!can_vma_merge(prev, newflags))
-
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