t5561: drop curl stderr redirects

For a normal test run, stderr is already redirected to
/dev/null by the test suite. When used with "-v",
suppressing stderr is actively harmful, as it may hide the
reason for curl failing.

Reported-by: Jens Krüger <Jens.Krueger@frm2.tum.de>
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

t/t5561-http-backend.sh

@@ -6,7 +6,7 @@ test_description='test git-http-backend'
 start_httpd
 
 GET() {
-	curl --include "$HTTPD_URL/$SMART/repo.git/$1" >out 2>/dev/null &&
+	curl --include "$HTTPD_URL/$SMART/repo.git/$1" >out &&
 	tr '\015' Q <out |
 	sed '
 		s/Q$//
@@ -19,7 +19,7 @@ GET() {
 POST() {
 	curl --include --data "$2" \
 	--header "Content-Type: application/x-$1-request" \
-	"$HTTPD_URL/smart/repo.git/$1" >out 2>/dev/null &&
+	"$HTTPD_URL/smart/repo.git/$1" >out &&
 	tr '\015' Q <out |
 	sed '
 		s/Q$//