[PATCH] pinctrl: fix CONFIG_PINCTRL=n build failure

[Arnd Bergmann <arnd@kernel.org>]

From: Arnd Bergmann <arnd@arndb.de>

If pinctrl/consumer.h is included before linux/errno.h, the missing
error number macros cause a build failure:

In file included from drivers/gpu/drm/tilcdc/tilcdc_drv.c:9:
include/linux/pinctrl/consumer.h:110:10: error: use of undeclared identifier 'ENOTSUPP'
  110 |         return -ENOTSUPP;
      |                 ^~~~~~~~

Include linux/errno.h indirectly.

Fixes: b44aec87658e ("pinctrl: make the CONFIG_PINCTRL=n gpio config stubs return -ENOTSUPP")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
 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>
-- 
2.53.0