Merge pull request #417 from orlitzky/missing-stdio-in-rbl

librbl/rbl.c: add missing stdio.h

Author: thegushi

librbl/rbl.c

@@ -16,6 +16,7 @@
 #include <string.h>
 #include <assert.h>
 #include <errno.h>
+#include <stdio.h>
 
 /* librbl includes */
 #include "rbl.h"