block-sha1: make the size member first in the context struct

This is a 64-bit value, hence having it first provides a better
alignment.

Signed-off-by: Nicolas Pitre <nico@cam.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

block-sha1/sha1.h

@@ -5,9 +5,9 @@
  */
 
 typedef struct {
+	unsigned long long size;
 	unsigned int H[5];
 	unsigned int W[16];
-	unsigned long long size;
 } blk_SHA_CTX;
 
 void blk_SHA1_Init(blk_SHA_CTX *ctx);