clean up newbytes and newints to remove offset macro.

Reference: /n/atom/patch/applied/tlshandnit
Date: Thu Sep 24 04:48:40 CES 2015
Signed-off-by: quanstro@quanstro.net

--- /sys/src/libsec/port/tlshand.c	Thu Sep 24 04:48:12 2015
+++ /sys/src/libsec/port/tlshand.c	Thu Sep 24 04:48:14 2015
@@ -34,7 +34,7 @@
 
 typedef struct Ints{
 	int len;
-	int data[1];  // [len]
+	int data[];
 } Ints;
 
 typedef struct Algs{
@@ -2896,14 +2896,12 @@
 	return (p[0]<<8)|p[1];
 }
 
-#define OFFSET(x, s) offsetof(s, x)
-
 static Bytes*
 newbytes(int len)
 {
 	Bytes* ans;
 
-	ans = (Bytes*)emalloc(OFFSET(data[0], Bytes) + len);
+	ans = emalloc(sizeof(*ans) + len*sizeof(ans->data[0]));
 	ans->len = len;
 	return ans;
 }
@@ -2933,7 +2931,7 @@
 {
 	Ints* ans;
 
-	ans = (Ints*)emalloc(OFFSET(data[0], Ints) + len*sizeof(int));
+	ans = emalloc(sizeof(*ans) + len*sizeof(ans->data[0]));
 	ans->len = len;
 	return ans;
 }