Don't use hack/make.sh for validate-git-marks

hack/make.sh now does not make a difference, so simplify.

Signed-off-by: Miloslav Trmač <mitr@redhat.com>

Makefile

@@ -223,7 +223,7 @@ test-all-local: validate-local validate-docs test-unit-local
 
 .PHONY: validate-local
 validate-local:
-	BUILDTAGS="${BUILDTAGS}" hack/make.sh validate-git-marks
+	hack/validate-git-marks.sh
 	hack/validate-gofmt.sh
 	hack/validate-lint.sh
 	BUILDTAGS="${BUILDTAGS}" hack/validate-vet.sh

hack/validate-git-marks.sh

@@ -36,5 +36,5 @@ else
 		echo 'Please fix the conflict(s) commit the result.'
 		echo
 	} >&2
-	false
+	exit 1
 fi