[SPARC32]: Fix UP build with spinlock debugging enabled.

atomic32.c assumes that arbitrary stuff can be passed into
spin_lock() on non-SMP builds, which is true except for when
spinlock debugging is enabled.
Signed-off-by: David S. Miller <davem@davemloft.net>

arch/sparc/lib/atomic32.c

@@ -20,8 +20,9 @@ spinlock_t __atomic_hash[ATOMIC_HASH_SIZE] = {
 
 #else /* SMP */
 
+static spinlock_t dummy = SPIN_LOCK_UNLOCKED;
 #define ATOMIC_HASH_SIZE	1
-#define ATOMIC_HASH(a)		0
+#define ATOMIC_HASH(a)		(&dummy)
 
 #endif /* SMP */