since 0 passed into a vararg function is going to be 32-bits, on a 64-bit
machine that leaves 32-bits on the stack unaccounted for.  those bits could
be anything.  if the called varadic function expects char*s (64-bit),
this is not going to end well.  make sure to pass in "full-width" zeros.

Reference: /n/atom/patch/applied/ventibootcrash
Date: Fri Apr  4 07:34:47 CES 2014
Signed-off-by: quanstro@quanstro.net

--- /sys/src/nix/boot/local.c	Fri Apr  4 07:33:22 2014
+++ /sys/src/nix/boot/local.c	Fri Apr  4 07:33:22 2014
@@ -212,7 +212,7 @@
 				f[2] = "tcp!127.1!8000";
 			}
 			configloopback();
-			run("/boot/venti", "-c", f[0], "-a", f[1], "-h", f[2], 0);
+			run("/boot/venti", "-c", f[0], "-a", f[1], "-h", f[2], nil);
 			/*
 			 * If the announce address is tcp!*!foo, then set
 			 * $venti to tcp!127.1!foo instead, which is actually dialable.
@@ -233,7 +233,7 @@
 
 	/* start fossil */
 	print("fossil(%s)...", partition);
-	run("/boot/fossil", "-f", partition, "-c", "srv -A fboot", "-c", "srv -p fscons", 0);
+	run("/boot/fossil", "-f", partition, "-c", "srv -A fboot", "-c", "srv -p fscons", nil);
 	fd = open("#s/fboot", ORDWR);
 	if(fd < 0){
 		print("open #s/fboot: %r\n");