[S390] arch/s390/kernel: Add missing unlock

Author: Julia Lawall <julia@diku.dk>

In the default case the lock is not unlocked.  The return is
converted to a goto, to share the unlock at the end of the function.

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

// 
@r exists@
expression E1;
identifier f;
@@

f (...) { <+...
* spin_lock_irq (E1,...);
... when != E1
* return ...;
...+> }
// 

Signed-off-by: Julia Lawall 
Signed-off-by: Heiko Carstens 
Signed-off-by: Martin Schwidefsky 

---
 arch/s390/kernel/topology.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)
 
diff --git a/arch/s390/kernel/topology.c b/arch/s390/kernel/topology.c
index 14ef6f0..247b4c2 100644
--- a/arch/s390/kernel/topology.c
+++ b/arch/s390/kernel/topology.c
@@ -165,10 +165,11 @@ static void tl_to_cores(struct tl_info *info)
 		default:
 			clear_cores();
 			machine_has_topology = 0;
-			return;
+			goto out;
 		}
 		tle = next_tle(tle);
 	}
+out:
 	spin_unlock_irq(&topology_lock);
 }