ACPICA: Fix a couple warnings detected on FreeBSD build

This fixes a global and a pointer cast. Jung-uk Kim.

Signed-off-by: Jung-uk Kim <jkim@FreeBSD.org>
Signed-off-by: Bob Moore <robert.moore@intel.com>
Signed-off-by: Lv Zheng <lv.zheng@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

drivers/acpi/acpica/acglobal.h

@@ -413,7 +413,7 @@ ACPI_EXTERN u8 acpi_gbl_db_output_flags;
 
 #ifdef ACPI_DISASSEMBLER
 
-u8 ACPI_INIT_GLOBAL(acpi_gbl_ignore_noop_operator, FALSE);
+ACPI_EXTERN u8 ACPI_INIT_GLOBAL(acpi_gbl_ignore_noop_operator, FALSE);
 
 ACPI_EXTERN u8 acpi_gbl_db_opt_disasm;
 ACPI_EXTERN u8 acpi_gbl_db_opt_verbose;