Clean up lint in various packages

Changes fall into one of the following:

- gofmt -s
- receiver name is inconsistent
- omit unused 2nd value from range
- godoc comment formed incorrectly
- err assigned and not used
- if block ends with a return statement followed by else

tpl/collections/collections.go

@@ -503,25 +503,25 @@ func (i *intersector) appendIfNotSeen(v reflect.Value) {
 	}
 }
 
-func (ins *intersector) handleValuePair(l1vv, l2vv reflect.Value) {
+func (i *intersector) handleValuePair(l1vv, l2vv reflect.Value) {
 	switch kind := l1vv.Kind(); {
 	case kind == reflect.String:
 		l2t, err := toString(l2vv)
 		if err == nil && l1vv.String() == l2t {
-			ins.appendIfNotSeen(l1vv)
+			i.appendIfNotSeen(l1vv)
 		}
 	case isNumber(kind):
 		f1, err1 := numberToFloat(l1vv)
 		f2, err2 := numberToFloat(l2vv)
 		if err1 == nil && err2 == nil && f1 == f2 {
-			ins.appendIfNotSeen(l1vv)
+			i.appendIfNotSeen(l1vv)
 		}
 	case kind == reflect.Ptr, kind == reflect.Struct:
 		if l1vv.Interface() == l2vv.Interface() {
-			ins.appendIfNotSeen(l1vv)
+			i.appendIfNotSeen(l1vv)
 		}
 	case kind == reflect.Interface:
-		ins.handleValuePair(reflect.ValueOf(l1vv.Interface()), l2vv)
+		i.handleValuePair(reflect.ValueOf(l1vv.Interface()), l2vv)
 	}
 }
 

tpl/fmt/fmt.go

@@ -37,7 +37,7 @@ func (ns *Namespace) Printf(format string, a ...interface{}) string {
 
 }
 
-// Print returns string representation of the passed arguments ending with a newline.
+// Println returns string representation of the passed arguments ending with a newline.
 func (ns *Namespace) Println(a ...interface{}) string {
 	return _fmt.Sprintln(a...)
 }

tpl/images/images.go

@@ -23,6 +23,7 @@ import (
 	_ "image/jpeg"
 	_ "image/png"
 
+	// Import webp codec
 	_ "golang.org/x/image/webp"
 
 	"github.com/gohugoio/hugo/deps"