build: fix problems found with ineffasign linter

backend/azureblob/azureblob.go

@@ -392,7 +392,6 @@ func NewFs(name, root string, m configmap.Mapper) (fs.Fs, error) {
 				return nil, errors.New("Container name in SAS URL and container provided in command do not match")
 			}
 
-			container = parts.ContainerName
 			containerURL = azblob.NewContainerURL(*u, pipeline)
 		} else {
 			serviceURL = azblob.NewServiceURL(*u, pipeline)

backend/cache/cache_internal_test.go

@@ -726,6 +726,7 @@ func TestInternalChangeSeenAfterRc(t *testing.T) {
 
 	// Call the rc function
 	m, err := cacheExpire.Fn(rc.Params{"remote": "data.bin"})
+	require.NoError(t, err)
 	require.Contains(t, m, "status")
 	require.Contains(t, m, "message")
 	require.Equal(t, "ok", m["status"])
@@ -735,18 +736,21 @@ func TestInternalChangeSeenAfterRc(t *testing.T) {
 	co, err = rootFs.NewObject("data.bin")
 	require.NoError(t, err)
 	require.Equal(t, wrappedTime.Unix(), co.ModTime().Unix())
-	li1, err := runInstance.list(t, rootFs, "")
+	_, err = runInstance.list(t, rootFs, "")
+	require.NoError(t, err)
 
 	// create some rand test data
 	testData2 := randStringBytes(int(chunkSize))
 	runInstance.writeObjectBytes(t, cfs.UnWrap(), runInstance.encryptRemoteIfNeeded(t, "test2"), testData2)
 
 	// list should have 1 item only
-	li1, err = runInstance.list(t, rootFs, "")
+	li1, err := runInstance.list(t, rootFs, "")
+	require.NoError(t, err)
 	require.Len(t, li1, 1)
 
 	// Call the rc function
 	m, err = cacheExpire.Fn(rc.Params{"remote": "/"})
+	require.NoError(t, err)
 	require.Contains(t, m, "status")
 	require.Contains(t, m, "message")
 	require.Equal(t, "ok", m["status"])
@@ -754,6 +758,7 @@ func TestInternalChangeSeenAfterRc(t *testing.T) {
 
 	// list should have 2 items now
 	li2, err := runInstance.list(t, rootFs, "")
+	require.NoError(t, err)
 	require.Len(t, li2, 2)
 }
 
@@ -1490,7 +1495,8 @@ func (r *run) updateData(t *testing.T, rootFs fs.Fs, src, data, append string) e
 	var err error
 
 	if r.useMount {
-		f, err := os.OpenFile(path.Join(runInstance.mntDir, src), os.O_TRUNC|os.O_CREATE|os.O_WRONLY, 0644)
+		var f *os.File
+		f, err = os.OpenFile(path.Join(runInstance.mntDir, src), os.O_TRUNC|os.O_CREATE|os.O_WRONLY, 0644)
 		if err != nil {
 			return err
 		}
@@ -1500,7 +1506,8 @@ func (r *run) updateData(t *testing.T, rootFs fs.Fs, src, data, append string) e
 		}()
 		_, err = f.WriteString(data + append)
 	} else {
-		obj1, err := rootFs.NewObject(src)
+		var obj1 fs.Object
+		obj1, err = rootFs.NewObject(src)
 		if err != nil {
 			return err
 		}

backend/drive/drive.go

@@ -2586,6 +2586,9 @@ func (o *Object) Update(in io.Reader, src fs.ObjectInfo, options ...fs.OpenOptio
 		return err
 	}
 	newO, err := o.fs.newObjectWithInfo(src.Remote(), info)
+	if err != nil {
+		return err
+	}
 	switch newO := newO.(type) {
 	case *Object:
 		*o = *newO
@@ -2624,6 +2627,9 @@ func (o *documentObject) Update(in io.Reader, src fs.ObjectInfo, options ...fs.O
 	remote = remote[:len(remote)-o.extLen]
 
 	newO, err := o.fs.newObjectWithInfo(remote, info)
+	if err != nil {
+		return err
+	}
 	switch newO := newO.(type) {
 	case *documentObject:
 		*o = *newO

fs/rc/cache_test.go

@@ -114,11 +114,11 @@ func TestGetFsAndRemoteNamed(t *testing.T) {
 	assert.NotNil(t, f)
 	assert.Equal(t, "hello", remote)
 
-	f, remote, err = GetFsAndRemoteNamed(in, "fsX", "remote")
+	f, _, err = GetFsAndRemoteNamed(in, "fsX", "remote")
 	require.Error(t, err)
 	assert.Nil(t, f)
 
-	f, remote, err = GetFsAndRemoteNamed(in, "fs", "remoteX")
+	f, _, err = GetFsAndRemoteNamed(in, "fs", "remoteX")
 	require.Error(t, err)
 	assert.Nil(t, f)
 

fs/rc/config_test.go

@@ -74,7 +74,7 @@ func TestOptionsSet(t *testing.T) {
 			"Int": 50,
 		},
 	}
-	out, err = call.Fn(in)
+	_, err = call.Fn(in)
 	require.Error(t, err)
 	assert.Contains(t, err.Error(), "unknown option block")
 
@@ -82,7 +82,7 @@ func TestOptionsSet(t *testing.T) {
 	in = Params{
 		"potato": []string{"a", "b"},
 	}
-	out, err = call.Fn(in)
+	_, err = call.Fn(in)
 	require.Error(t, err)
 	assert.Contains(t, err.Error(), "failed to write options")
 }