remove double space before exit on line 113

Signed-off-by: Carlos Eduardo Arango Gutierrez <carangog@redhat.com>

Makefile

@@ -113,7 +113,7 @@ test:
 	$(GO_CMD) test ./cmd/... ./pkg/...
 
 e2e-test:
-	@if [ -z ${KUBECONFIG} ]; then echo "[ERR] KUBECONFIG missing, must be defined";  exit 1; fi
+	@if [ -z ${KUBECONFIG} ]; then echo "[ERR] KUBECONFIG missing, must be defined"; exit 1; fi
 	$(GO_CMD) test -v ./test/e2e/ -args -nfd.repo=$(IMAGE_REPO) -nfd.tag=$(IMAGE_TAG_NAME) -kubeconfig=$(KUBECONFIG) -nfd.e2e-config=$(E2E_TEST_CONFIG) -ginkgo.focus="\[NFD\]"
 
 push: