t: assume test_cmp produces verbose output

Some tests call test_cmp, and if it fails show the actual
output generated. This is mostly pointless, as test_cmp will
already show a diff between the expected and actual output.
It also fools --chain-lint by putting an "||" in the middle
of the chain, so we'd rather not use this construct.

Note that these cases actually show a pre-processed version
of the data, rather than exactly what test_cmp would show.
However, test_cmp's output is generally good for pointing
the user in the right direction, and they can then dig in
the trash directory themselves if they want to see more
details.

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

t/t6012-rev-list-simplify.sh

@@ -95,10 +95,7 @@ check_outcome () {
 		git log --pretty="$FMT" --parents $param |
 		unnote >actual &&
 		sed -e "s/^.*	\([^ ]*\) .*/\1/" >check <actual &&
-		test_cmp expect check || {
-			cat actual
-			false
-		}
+		test_cmp expect check
 	'
 }
 
@@ -121,10 +118,7 @@ test_expect_success 'full history simplification without parent' '
 	git log --pretty="$FMT" --full-history E -- lost |
 	unnote >actual &&
 	sed -e "s/^.*	\([^ ]*\) .*/\1/" >check <actual &&
-	test_cmp expect check || {
-		cat actual
-		false
-	}
+	test_cmp expect check
 '
 
 test_expect_success '--full-diff is not affected by --parents' '

t/t6111-rev-list-treesame.sh

@@ -92,10 +92,7 @@ check_outcome () {
 		git log --format="$FMT" $param |
 		unnote >actual &&
 		sed -e "$munge_actual" <actual >check &&
-		test_cmp expect check || {
-			cat actual
-			false
-		}
+		test_cmp expect check
 	'
 }