enable revive linter

.golangci.yml

@@ -1,5 +1,12 @@
 issues:
   max-same-issues: 0
+  exclude-rules: 
+  - linters: 
+    - revive
+    text:  "var-naming"
+  - linters: 
+    - revive
+    text:  "exported"
 linters:
   enable:
     - durationcheck
@@ -9,6 +16,7 @@ linters:
     - gofumpt
     - gosimple
     - misspell
+    - revive
     - typecheck
     - unparam
   disable:

disk/disk_linux.go

@@ -486,9 +486,8 @@ func LabelWithContext(ctx context.Context, name string) (string, error) {
 	dmname, err := ioutil.ReadFile(dmname_filename)
 	if err != nil {
 		return "", err
-	} else {
-		return strings.TrimSpace(string(dmname)), nil
 	}
+	return strings.TrimSpace(string(dmname)), nil
 }
 
 func getFsType(stat unix.Statfs_t) string {

host/types.go

@@ -15,9 +15,8 @@ func (w *Warnings) Add(err error) {
 func (w *Warnings) Reference() error {
 	if len(w.List) > 0 {
 		return w
-	} else {
-		return nil
 	}
+	return nil
 }
 
 func (w *Warnings) Error() string {

process/process_linux.go

@@ -503,13 +503,12 @@ func (p *Process) EnvironWithContext(ctx context.Context) ([]string, error) {
 func limitToUint(val string) (uint64, error) {
 	if val == "unlimited" {
 		return math.MaxUint64, nil
-	} else {
-		res, err := strconv.ParseUint(val, 10, 64)
-		if err != nil {
-			return 0, err
-		}
-		return res, nil
 	}
+	res, err := strconv.ParseUint(val, 10, 64)
+	if err != nil {
+		return 0, err
+	}
+	return res, nil
 }
 
 // Get num_fds from /proc/(pid)/limits