xfuncs: import xstrndup() from busybox

This function is needed for the fixed length string feature in the state
framework.

Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

1 files changed, 1 insertions, 0 deletions

diff --git a/include/xfuncs.h b/include/xfuncs.h
index 8efc99dbc4..940a1d67ed 100644
--- a/include/xfuncs.h
+++ b/include/xfuncs.h
@@ -7,6 +7,7 @@ void *xmalloc(size_t size);
 void *xrealloc(void *ptr, size_t size);
 void *xzalloc(size_t size);
 char *xstrdup(const char *s);
+char *xstrndup(const char *s, size_t size);
 void* xmemalign(size_t alignment, size_t bytes);
 void* xmemdup(const void *orig, size_t size);