note negative adjustments as negative, and clear buffer before sending

Reference: /n/atom/patch/applied/fssntpclean
Date: Wed Apr 16 04:13:40 CES 2014
Signed-off-by: quanstro@quanstr.net

--- /sys/src/fs/ip/sntp.c	Wed Apr 16 04:10:17 2014
+++ /sys/src/fs/ip/sntp.c	Wed Apr 16 04:10:18 2014
@@ -117,9 +117,7 @@
 	if(dt = now-time()){
 		settime(now);
 		setrtc(now);
-		if(dt < 0)
-			dt = -dt;
-		if(dt > 1 || (cons.flags&sntp.flag))
+		if(abs(dt) > 1 || (cons.flags&sntp.flag))
 			print("sntp: %t [adjust %+ld]\n", now, (long)dt);
 	}
 	sntp.gotreply = 1;
@@ -158,6 +156,7 @@
 	/* compose a UDP sntp request */
 	dprint("sntp: sending to %I on ifc %I\n", sntpip, ifc->ipa);
 	mb = mballoc(Ensize+Ipsize+Udpsize+Sntpsize, 0, Mbsntp);
+	memset(mb->data, 0, Ensize+Ipsize+Udpsize+Sntpsize);
 	s = (Sntppkt*)mb->data;
 	/* IP fields */	
 	memmove(s->src, ifc->ipa, Pasize);
--- /sys/src/fs/mkfile	Wed Apr 16 04:10:19 2014
+++ /sys/src/fs/mkfile	Wed Apr 16 04:10:20 2014
@@ -1,7 +1,6 @@
 ARCH=\
 	aska\
 	buda\
-	dahlonega\
 	fairyland\
 	fs64\
 	fs\