t0003: use named parameters in attr_check()

We had named the parameters in attr_check() but $2 was being used
instead of $expect. Make all variable accesses in attr_check() use named
variables instead of numbered arguments for clarity.

While we're at it, add variable assignments to the &&-chain. These
aren't ever expected to fail but if a future developer ever adds some
code above the assignments and they could fail in some way, the intact
&&-chain will ensure that the failure is caught.

Signed-off-by: Denton Liu <liu.denton@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

t/t0003-attributes.sh

@@ -5,19 +5,16 @@ test_description=gitattributes
 . ./test-lib.sh
 
 attr_check () {
-	path="$1" expect="$2"
+	path="$1" expect="$2" git_opts="$3" &&
 
-	git $3 check-attr test -- "$path" >actual 2>err &&
-	echo "$path: test: $2" >expect &&
+	git $git_opts check-attr test -- "$path" >actual 2>err &&
+	echo "$path: test: $expect" >expect &&
 	test_cmp expect actual &&
 	test_line_count = 0 err
 }
 
 attr_check_quote () {
-
-	path="$1"
-	quoted_path="$2"
-	expect="$3"
+	path="$1" quoted_path="$2" expect="$3" &&
 
 	git check-attr test -- "$path" >actual &&
 	echo "\"$quoted_path\": test: $expect" >expect &&