test-sha1: test hashing large buffer

test to hash a large buffer in one go is more important than
hashing large amount of data in small fixed chunks.

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

test-sha1.sh

@@ -11,7 +11,7 @@ do
 			test -z "$pfx" || echo "$pfx"
 			dd if=/dev/zero bs=1048576 count=$cnt 2>/dev/null |
 			tr '[\0]' '[g]'
-		} | ./test-sha1
+		} | ./test-sha1 $cnt
 	`
 	if test "$expect" = "$actual"
 	then