[PATCH] pinctrl: include linux/errno.h in consumer.h for ENOTSUPP

[Mehmet Fide <mehmet.fide@gmail.com>]

From: Mehmet Fide <mehmet.fide@screeningeagle.com>

The CONFIG_PINCTRL=n stubs of pinctrl_gpio_get_config() and
pinctrl_gpio_set_config() return -ENOTSUPP, but the header only pulls in
linux/err.h, which provides asm/errno.h and not the kernel-internal
ENOTSUPP from linux/errno.h. A translation unit that includes
pinctrl/consumer.h before anything else fails to build:

  include/linux/pinctrl/consumer.h:110:10: error: use of undeclared identifier 'ENOTSUPP'

Include linux/errno.h explicitly.

Fixes: b44aec87658e ("pinctrl: make the CONFIG_PINCTRL=n gpio config stubs return -ENOTSUPP")
Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202609240855.U59akHDO-lkp@intel.com/
Closes: https://lore.kernel.org/oe-kbuild-all/202609241240.61Hz5rix-lkp@intel.com/
Signed-off-by: Mehmet Fide <mehmet.fide@screeningeagle.com>
---
 include/linux/pinctrl/consumer.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/include/linux/pinctrl/consumer.h b/include/linux/pinctrl/consumer.h
index 7be49d447426..81e7866bd2e3 100644
--- a/include/linux/pinctrl/consumer.h
+++ b/include/linux/pinctrl/consumer.h
@@ -12,6 +12,7 @@
 #define __LINUX_PINCTRL_CONSUMER_H
 
 #include <linux/err.h>
+#include <linux/errno.h>
 #include <linux/types.h>
 
 #include <linux/pinctrl/pinctrl-state.h>
-- 
2.55.0