drivers/char/mmtimer.c: eliminate useless code

Author: Julia Lawall <julia@diku.dk>

The variable x is initialized twice to the same (side effect-free)
expression.  Drop one initialization.

A simplified version of the semantic match that finds this problem is:
(http://coccinelle.lip6.fr/)

// 
@forall@
idexpression *x;
identifier f!=ERR_PTR;
@@

x = f(...)
... when != x
(
x = f(...,<+...x...+>,...)
|
* x = f(...)
)
// 

Stefan observed:

  The next x = rb_entry(mn->next, struct mmtimer, list); is preceded by a
  test whether mn->next is NULL.

  Unless that test is redundant too, your patch fixes a potential NULL
  pointer dereference, introduced by commit cbacdd95 "SGI Altix mmtimer:
  allow larger number of timers per node" in 2.6.26.

Signed-off-by: Julia Lawall 
Cc: Stefan Richter 
Cc: Dimitri Sivanich 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds 

---
 drivers/char/mmtimer.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
 
diff --git a/drivers/char/mmtimer.c b/drivers/char/mmtimer.c
index 918711a..04fd0d8 100644
--- a/drivers/char/mmtimer.c
+++ b/drivers/char/mmtimer.c
@@ -546,7 +546,7 @@ static void mmtimer_tasklet(unsigned long data)
 {
 	int nodeid = data;
 	struct mmtimer_node *mn = &timers[nodeid];
-	struct mmtimer *x = rb_entry(mn->next, struct mmtimer, list);
+	struct mmtimer *x;
 	struct k_itimer *t;
 	unsigned long flags;