[patch] exit: silence a bogus static checker warning

[Dan Carpenter <dan.carpenter@oracle.com>]

Smatch complains about this:

	kernel/exit.c:543 forget_original_parent()
	warn: add some parenthesis here?

I don't normally advocate changing the code to make the static checker
happy but these are normally precedence bugs so I think it's ok to put
parenthesis so it's clear the code is deliberate.

Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>

diff --git a/kernel/exit.c b/kernel/exit.c
index 6192422..1192d12 100644
--- a/kernel/exit.c
+++ b/kernel/exit.c
@@ -540,7 +540,7 @@ static void forget_original_parent(struct task_struct *father)
 	list_for_each_entry(p, &father->children, sibling) {
 		for_each_thread(p, t) {
 			t->real_parent = reaper;
-			BUG_ON(!t->ptrace != (t->parent == father));
+			BUG_ON((!t->ptrace) != (t->parent == father));
 			if (likely(!t->ptrace))
 				t->parent = t->real_parent;
 			if (t->pdeath_signal)