fix __exit_mm() dereference before check.

[Dave Jones]

>From a quick look, it appears passing NULL mm's down to mm_release()
isn't a good idea.

		Dave


--- linux-2.6.5/kernel/exit.c~	2004-04-16 22:06:00.000000000 +0100
+++ linux-2.6.5/kernel/exit.c	2004-04-16 22:06:51.000000000 +0100
@@ -482,9 +482,10 @@
 {
 	struct mm_struct *mm = tsk->mm;
 
-	mm_release(tsk, mm);
 	if (!mm)
 		return;
+	mm_release(tsk, mm);
+
 	/*
 	 * Serialize with any possible pending coredump.
 	 * We must hold mmap_sem around checking core_waiters
-
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