remove lint from Makefile. It could give false alarms.

Makefile

@@ -6,7 +6,6 @@
 	updatetestdeps \
 	build \
 	proto \
-	lint \
 	pretest \
 	test \
 	testrace \
@@ -39,13 +38,7 @@ proto:
 		protoc -I $$(dirname $$file) --go_out=plugins=grpc:$$(dirname $$file) $$file; \
 	done
 
-lint: testdeps
-	go get -v github.com/golang/lint/golint
-	for file in $$(git ls-files '*.go' | grep -v '\.pb\.go$$' | grep -v '_string\.go$$'); do \
-		golint $$file; \
-	done
-
-pretest: lint
+pretest:
 
 test: pretest
 	go test -v -cpu 1,4 google.golang.org/grpc/...