ACPICA: haiku: Fix invalid value used for semaphores

ACPICA commit 49fe4f25483feec2f685b204ef19e28d92979e95

In Haiku, semaphores are represented by integers, not pointers.
So, we can't use NULL as the invalid/destroyed value, the correct value
is -1. Introduce a platform overridable define to allow this.

Fixes #162 (which was closed after coming to the conclusion that this
should be done, but the change was never done).

Link: https://github.com/acpica/acpica/commit/49fe4f25Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

drivers/acpi/acpica/utdelete.c

@@ -140,7 +140,7 @@ static void acpi_ut_delete_internal_obj(union acpi_operand_object *object)
 			(void)
 			    acpi_os_delete_semaphore
 			    (acpi_gbl_global_lock_semaphore);
-			acpi_gbl_global_lock_semaphore = NULL;
+			acpi_gbl_global_lock_semaphore = ACPI_SEMAPHORE_NULL;
 
 			acpi_os_delete_mutex(object->mutex.os_mutex);
 			acpi_gbl_global_lock_mutex = NULL;
@@ -157,7 +157,7 @@ static void acpi_ut_delete_internal_obj(union acpi_operand_object *object)
 				  object, object->event.os_semaphore));
 
 		(void)acpi_os_delete_semaphore(object->event.os_semaphore);
-		object->event.os_semaphore = NULL;
+		object->event.os_semaphore = ACPI_SEMAPHORE_NULL;
 		break;
 
 	case ACPI_TYPE_METHOD:

drivers/acpi/acpica/utinit.c

@@ -154,7 +154,7 @@ acpi_status acpi_ut_init_globals(void)
 
 	/* Global Lock support */
 
-	acpi_gbl_global_lock_semaphore = NULL;
+	acpi_gbl_global_lock_semaphore = ACPI_SEMAPHORE_NULL;
 	acpi_gbl_global_lock_mutex = NULL;
 	acpi_gbl_global_lock_acquired = FALSE;
 	acpi_gbl_global_lock_handle = 0;

include/acpi/platform/acenv.h

@@ -252,6 +252,12 @@
 #define ACPI_RELEASE_GLOBAL_LOCK(Glptr, pending) pending = 0
 #endif
 
+/* NULL/invalid value to use for destroyed or not-yet-created semaphores. */
+
+#ifndef ACPI_SEMAPHORE_NULL
+#define ACPI_SEMAPHORE_NULL NULL
+#endif
+
 /* Flush CPU cache - used when going to sleep. Wbinvd or similar. */
 
 #ifndef ACPI_FLUSH_CPU_CACHE