Makefile: no DCO with git-validation on travis

Signed-off-by: Vincent Batts <[email protected]>

Author: vbatts

Makefile

@@ -72,7 +72,7 @@ endif
 .gitvalidation:
 	@which git-validation > /dev/null 2>/dev/null || (echo "ERROR: git-validation not found. Consider 'make install.tools' target" && false)
 ifdef TRAVIS_COMMIT_RANGE
-	git-validation -q -run DCO,short-subject,dangling-whitespace
+	git-validation -q -run short-subject,dangling-whitespace
 else
 	git-validation -v -run DCO,short-subject,dangling-whitespace -range $(EPOCH_TEST_COMMIT)..HEAD
 endif