enable go vet

.travis.yml

@@ -16,7 +16,7 @@ before_script:
   - gofmt -l -w .
   - goimports -l -w .
   - golint .
-  # - go vet ./...
+  - go vet ./...
   # - go test -race ./...
 script:
   - ./gocoverage.sh

event/profile.tmp

@@ -0,0 +1,40 @@
+mode: count
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+github.com/ethereum/go-ethereum/event/event.go:68.48,71.17 3 3513
+github.com/ethereum/go-ethereum/event/event.go:75.2,77.27 3 3511
+github.com/ethereum/go-ethereum/event/event.go:80.2,80.12 1 3509
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+github.com/ethereum/go-ethereum/event/event.go:89.28,91.4 1 3
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+github.com/ethereum/go-ethereum/event/event.go:180.2,180.19 0 1571