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vt: fix off by one memory corruption

account for the final 0 byte in host_buf.

--- a/sys/src/cmd/vt/main.c

+++ b/sys/src/cmd/vt/main.c

@@ -183,7 +183,7 @@

 		break;

 	}ARGEND;

-	host_buf = malloc(host_bsize);

+	host_buf = mallocz(host_bsize, 1);

 	hostp = host_buf;

 	hostlength = 0;

@@ -808,8 +808,8 @@

 set_host(Event *e)

 {

 	hostlength = e->n;

-	if(hostlength > host_bsize) {

-		host_bsize *= 2;

+	if(hostlength >= host_bsize) {

+		host_bsize = BSIZE*((hostlength + BSIZE)/BSIZE);

 		host_buf = realloc(host_buf,host_bsize);

 	}

 	hostp = host_buf;

-- 

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