[PATCH] gpiolib: add missing include

[Bartosz Golaszewski <brgl@xxxxxxxx>]

From: Bartosz Golaszewski <bartosz.golaszewski@xxxxxxxxxx>

With some randconfigs I'm seeing the following error:

In file included from drivers/gpio/gpiolib-swnode.c:19:
./include/linux/gpio/consumer.h: In function ‘gpiod_enable_hw_timestamp_ns’:
./include/linux/gpio/consumer.h:557:17: error: implicit declaration of function ‘WARN_ON’ [-Wimplicit-function-declaration]
  557 |                 WARN_ON(desc);
      |                 ^~~~~~~

Pull in bug.h to fix it.

Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@xxxxxxxxxx>
---
 include/linux/gpio/consumer.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/include/linux/gpio/consumer.h b/include/linux/gpio/consumer.h
index db2dfbae8edb..0b1acd014186 100644
--- a/include/linux/gpio/consumer.h
+++ b/include/linux/gpio/consumer.h
@@ -3,6 +3,7 @@
 #define __LINUX_GPIO_CONSUMER_H
 
 #include <linux/bits.h>
+#include <linux/bug.h>
 #include <linux/types.h>
 
 struct acpi_device;
-- 
2.45.2