ACPI: un-export ACPI_WARNING() -- use printk(KERN_WARNING...)

Signed-off-by: Len Brown <len.brown@intel.com>
diff --git a/drivers/acpi/hotkey.c b/drivers/acpi/hotkey.c
index 37dcb1f..f5da971 100644
--- a/drivers/acpi/hotkey.c
+++ b/drivers/acpi/hotkey.c
@@ -983,7 +983,7 @@
 
 		}
 	} else {
-		ACPI_WARNING((AE_INFO, "Not supported"));
+		printk(KERN_WARNING "Not supported\n");
 		return_VALUE(-EINVAL);
 	}
 	return_VALUE(count);