make: use correct location for [test_go_megacheck]

License: MIT
Signed-off-by: Zach Ramsay <zach.ramsay@gmail.com>

Rules.mk

@@ -66,13 +66,6 @@ include $(dir)/Rules.mk
 # -------------------- #
 #     core targets     #
 # -------------------- #
-PACKAGES_NOVENDOR := $(shell go list github.com/ipfs/go-ipfs/... | grep -v /Godeps/)
-
-megacheck:
-	@go get honnef.co/go/tools/cmd/megacheck
-	@for pkg in ${PACKAGES_NOVENDOR}; do megacheck "$$pkg"; done
-
-.PHONY: megacheck
 
 build: $(TGT_BIN)
 .PHONY: build
@@ -149,6 +142,7 @@ help:
 	@echo '  test_go_short'
 	@echo '  test_go_expensive'
 	@echo '  test_go_race'
+	@echo '  test_go_megacheck'	 - Run the `megacheck` vetting tool
 	@echo '  test_sharness_short'
 	@echo '  test_sharness_expensive'
 	@echo '  test_sharness_race'

mk/golang.mk

@@ -13,6 +13,7 @@ CHECK_GO :=
 go-pkg-name=$(shell go list $(go-tags) github.com/ipfs/go-ipfs/$(1))
 go-main-name=$(notdir $(call go-pkg-name,$(1)))$(?exe)
 go-curr-pkg-tgt=$(d)/$(call go-main-name,$(d))
+go-pkgs-novendor=$(shell go list github.com/ipfs/go-ipfs/... | grep -v /Godeps/)
 
 go-tags=$(if $(GOTAGS), -tags="$(call join-with,$(space),$(GOTAGS))")
 go-flags-with-tags=$(GOFLAGS)$(go-tags)
@@ -39,6 +40,11 @@ test_go_fmt:
 .PHONY: test_go_fmt
 TEST_GO += test_go_fmt
 
+test_go_megacheck:
+	@go get honnef.co/go/tools/cmd/megacheck
+	@for pkg in $(go-pkgs-novendor); do megacheck "$$pkg"; done
+.PHONY: megacheck
+
 test_go: $(TEST_GO)
 
 check_go_version: