toshiba_acpi: Initialize hotkey_event_type variable

Commit 53147b6c ("toshiba_acpi: Fix
hotkeys registration on some toshiba models") fixed an issue on some
laptops regarding hotkeys registration, however, if failed to address
the initialization of the hotkey_event_type variable, and thus, it can
lead to potential unwanted effects as the variable is being checked.

This patch initializes such variable to avoid such unwanted effects.

Cc: <stable@vger.kernel.org> # 4.1+
Signed-off-by: Azael Avalos <coproscefalo@gmail.com>
Signed-off-by: Darren Hart <dvhart@linux.intel.com>

drivers/platform/x86/toshiba_acpi.c

@@ -2665,6 +2665,7 @@ static int toshiba_acpi_add(struct acpi_device *acpi_dev)
 	ret = toshiba_function_keys_get(dev, &dev->special_functions);
 	dev->kbd_function_keys_supported = !ret;
 
+	dev->hotkey_event_type = 0;
 	if (toshiba_acpi_setup_keyboard(dev))
 		pr_info("Unable to activate hotkeys\n");