[PATCH] acpi compile fix

ACPI is performing a spin_lock() on a `void *'.  That's OK when spin_lock is
implemented via an inline function.  But when it is implemented via macros
it causes compile-time breakage.

So cast it to the right type. It really should be fixed not to use opaque
handles, though.

drivers/acpi/osl.c

@@ -736,7 +736,7 @@ acpi_os_acquire_lock (
 	if (flags & ACPI_NOT_ISR)
 		ACPI_DISABLE_IRQS();
 
-	spin_lock(handle);
+	spin_lock((spinlock_t *)handle);
 
 	return_VOID;
 }
@@ -755,7 +755,7 @@ acpi_os_release_lock (
 	ACPI_DEBUG_PRINT ((ACPI_DB_MUTEX, "Releasing spinlock[%p] from %s level\n", handle,
 		((flags & ACPI_NOT_ISR) ? "non-interrupt" : "interrupt")));
 
-	spin_unlock(handle);
+	spin_unlock((spinlock_t *)handle);
 
 	if (flags & ACPI_NOT_ISR)
 		ACPI_ENABLE_IRQS();