hwspinlock: Don't return a value in __hwspin_unlock

Fix below build warning:

CC arch/arm/mach-omap2/hwspinlock.o
In file included from arch/arm/mach-omap2/hwspinlock.c:22:
include/linux/hwspinlock.h: In function '__hwspin_unlock':
include/linux/hwspinlock.h:121: warning: 'return' with a value, in function returning void

---
 include/linux/hwspinlock.h |    1 -
 1 files changed, 0 insertions(+), 1 deletions(-)

index 08a2fee..aad6bd4 100644
@@ -118,7 +118,6 @@ int __hwspin_trylock(struct hwspinlock *hwlock, int mode, unsigned long *flags)
 static inline
 void __hwspin_unlock(struct hwspinlock *hwlock, int mode, unsigned long *flags)
 {
-	return 0;
 }
 
 static inline int hwspin_lock_get_id(struct hwspinlock *hwlock)

1.7.5.4

Applied, thanks!