[PATCH] mfd: syscon: Include linux/err.h to fix build error

[Tushar Behera]

commit df73de9b0d412 ("mfd: syscon: Return -ENOSYS if CONFIG_MFD_SYSCON
is not enabled") introduced fallbacks for APIs, but missed out on adding
the header file. This would work only if linux/err.h is also included
in the source code from where this file is included. It would be better
to include linux/err.h in file to remove possible build errors.

Without this patch, we get following and similar build errors if this
header file is included in some source file and CONFIG_MFD_SYSCON is
not enabled.

include/linux/mfd/syscon.h: In function âsyscon_node_to_regmapâ:
include/linux/mfd/syscon.h:30:2: error: implicit declaration of function âERR_PTRâ [-Werror=implicit-function-declaration]
  return ERR_PTR(-ENOSYS);
  ^
include/linux/mfd/syscon.h:30:18: error: âENOSYSâ undeclared (first use in this function)
  return ERR_PTR(-ENOSYS);
                  ^

Signed-off-by: Tushar Behera <tushar.behera@xxxxxxxxxx>
---
 include/linux/mfd/syscon.h |    2 ++
 1 file changed, 2 insertions(+)

diff --git a/include/linux/mfd/syscon.h b/include/linux/mfd/syscon.h
index 8789fa3..75e543b 100644
--- a/include/linux/mfd/syscon.h
+++ b/include/linux/mfd/syscon.h
@@ -15,6 +15,8 @@
 #ifndef __LINUX_MFD_SYSCON_H__
 #define __LINUX_MFD_SYSCON_H__
 
+#include <linux/err.h>
+
 struct device_node;
 
 #ifdef CONFIG_MFD_SYSCON
-- 
1.7.9.5

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