correct hex() for 0 length outputs

diff --git a/lib/hex.c b/lib/hex.c
index bd4774a279f9d2d420e3cf6b0142f2be9fd906fd..f37db111354f87999e48d1ef249d64daef0d7511 100644 (file)
--- a/lib/hex.c
+++ b/lib/hex.c
@@ -33,6 +33,7 @@ char *hex(const uint8_t *ptr, size_t n) {
 
   while(n-- > 0)
     p += sprintf(p, "%02x", (unsigned)*ptr++);
+  *p = 0;
   return buf;
 }