remove a duplicate include

git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@48508 65c4cc65-6c06-0410-ace0-fbb531ad65f3

res/res_smdi.c

@@ -42,7 +42,6 @@ ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
 #include "asterisk/astobj.h"
 #include "asterisk/io.h"
 #include "asterisk/logger.h"
-#include "asterisk/utils.h"
 #include "asterisk/options.h"
 
 /* Message expiry time in milliseconds */