index-pack: write-or-die instead of unchecked write-in-full.

Signed-off-by: Junio C Hamano <junkio@cox.net>

index-pack.c

@@ -814,7 +814,7 @@ static void final(const char *final_pack_name, const char *curr_pack_name,
 		char buf[48];
 		int len = snprintf(buf, sizeof(buf), "%s\t%s\n",
 				   report, sha1_to_hex(sha1));
-		write_in_full(1, buf, len);
+		write_or_die(1, buf, len);
 
 		/*
 		 * Let's just mimic git-unpack-objects here and write