fix lint errors, run golangci-lint on Github actions

.github/workflows/golangci-lint.yml

@@ -0,0 +1,19 @@
+name: golangci-lint
+on:
+  push:
+    tags:
+      - v*
+    branches:
+      - master
+  pull_request:
+jobs:
+  golangci:
+    name: lint
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - name: golangci-lint
+        uses: golangci/golangci-lint-action@v1
+        with:
+          # Required: the version of golangci-lint is required and must be specified without patch version: we always use the latest patch version.
+          version: v1.30

.golangci.yml

@@ -0,0 +1,22 @@
+run:
+linters-settings:
+linters:
+  disable-all: true
+  enable:
+    - deadcode
+    - goconst
+    - goimports
+    - gosimple
+    - ineffassign
+    - misspell
+    - prealloc
+    - scopelint
+    - staticcheck
+    - stylecheck
+    - structcheck
+    - unconvert
+    - unparam
+    - unused
+    - varcheck
+    - vet
+

decoder_test.go

@@ -76,7 +76,7 @@ var _ = Describe("Decoder", func() {
 			Expect(err).To(MatchError(errNoDynamicTable))
 		})
 
-		It("errors when a non-existant static table entry is referenced", func() {
+		It("errors when a non-existent static table entry is referenced", func() {
 			data := appendVarInt(nil, 6, 10000)
 			data[0] ^= 0x80 | 0x40
 			_, err := decoder.Write(insertPrefix(data))

encoder_test.go

@@ -53,7 +53,7 @@ var _ = Describe("Encoder", func() {
 		Expect(data).To(BeEmpty())
 	})
 
-	It("encodes multipe fields", func() {
+	It("encodes multiple fields", func() {
 		hf1 := HeaderField{Name: "foobar", Value: "lorem ipsum"}
 		hf2 := HeaderField{Name: "raboof", Value: "dolor sit amet"}
 		Expect(encoder.WriteField(hf1)).To(Succeed())

integrationtests/interop/interop_suite_test.go

@@ -32,6 +32,9 @@ func readQIFs() {
 	qifDir := currentDir() + "/qifs/qifs"
 	Expect(qifDir).To(BeADirectory())
 	filepath.Walk(qifDir, func(path string, info os.FileInfo, err error) error {
+		if err != nil {
+			return err
+		}
 		if info.IsDir() {
 			return nil
 		}