fix golint issues

altsrc/map_input_source.go

@@ -22,15 +22,15 @@ func nestedVal(name string, tree map[interface{}]interface{}) (interface{}, bool
 	if sections := strings.Split(name, "."); len(sections) > 1 {
 		node := tree
 		for _, section := range sections[:len(sections)-1] {
-			if child, ok := node[section]; !ok {
+			child, ok := node[section]
+			if !ok {
 				return nil, false
-			} else {
-				if ctype, ok := child.(map[interface{}]interface{}); !ok {
-					return nil, false
-				} else {
-					node = ctype
-				}
 			}
+			ctype, ok := child.(map[interface{}]interface{})
+			if !ok {
+				return nil, false
+			}
+			node = ctype
 		}
 		if val, ok := node[sections[len(sections)-1]]; ok {
 			return val, true

altsrc/toml_file_loader.go

@@ -66,9 +66,9 @@ func unmarshalMap(i interface{}) (ret map[interface{}]interface{}, err error) {
 	return ret, nil
 }
 
-func (self *tomlMap) UnmarshalTOML(i interface{}) error {
+func (tm *tomlMap) UnmarshalTOML(i interface{}) error {
 	if tmp, err := unmarshalMap(i); err == nil {
-		self.Map = tmp
+		tm.Map = tmp
 	} else {
 		return err
 	}

altsrc/yaml_file_loader.go

@@ -86,7 +86,7 @@ func loadDataFrom(filePath string) ([]byte, error) {
 			return nil, fmt.Errorf("Cannot read from file: '%s' because it does not exist.", filePath)
 		}
 		return ioutil.ReadFile(filePath)
-	} else {
-		return nil, fmt.Errorf("unable to determine how to load from path %s", filePath)
 	}
+
+	return nil, fmt.Errorf("unable to determine how to load from path %s", filePath)
 }

app.go

@@ -491,7 +491,7 @@ func HandleAction(action interface{}, context *Context) (err error) {
 	} else if a, ok := action.(func(*Context)); ok { // deprecated function signature
 		a(context)
 		return nil
-	} else {
-		return errInvalidActionType
 	}
+
+	return errInvalidActionType
 }