[U-Boot] [PATCH v2 2/6] errno: Allow errno_str() to be used without CONFIG_ERRNO_STR

[Simon Glass <sjg@chromium.org>]

The pmic framework uses errno_str() and this requires board that use it to
enable CONFIG_ERRNO_STR to avoid a build error. Update the header to provide
a NULL error message when CONFIG_ERRNO_STR is not defined, and fix the build
error.

This will show as "(null)" when U-Boot prints it.

Signed-off-by: Simon Glass <sjg@chromium.org>
---

Changes in v2:
- Add new patch to allow errno_str() to be used without CONFIG_ERRNO_STR

 include/errno.h | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/include/errno.h b/include/errno.h
index 3942681..15ece2f 100644
--- a/include/errno.h
+++ b/include/errno.h
@@ -15,5 +15,10 @@ extern int errno;
 
 #ifdef CONFIG_ERRNO_STR
 const char *errno_str(int errno);
+#else
+static inline const char *errno_str(int errno)
+{
+	return 0;
+}
 #endif
 #endif /* _ERRNO_H */
-- 
2.8.0.rc3.226.g39d4020