tests/Null{Int,Time}: refactor Scan for less lines of code

Single switch for all cases.
Single return for the success case.

stubs_test.go

@@ -19,25 +19,18 @@ type NullInt struct {
 }
 
 // Satisfy sql.Scanner interface
-func (ni *NullInt) Scan(value interface{}) (err error) {
-	if value == nil {
-		ni.Integer, ni.Valid = 0, false
-		return
-	}
-
+func (ni *NullInt) Scan(value interface{}) error {
 	switch v := value.(type) {
+	case nil:
+		ni.Integer, ni.Valid = 0, false
 	case int:
 		ni.Integer, ni.Valid = v, true
-		return
 	case int8:
 		ni.Integer, ni.Valid = int(v), true
-		return
 	case int16:
 		ni.Integer, ni.Valid = int(v), true
-		return
 	case int32:
 		ni.Integer, ni.Valid = int(v), true
-		return
 	case int64:
 		const maxUint = ^uint(0)
 		const minUint = 0
@@ -48,25 +41,23 @@ func (ni *NullInt) Scan(value interface{}) (err error) {
 			return errors.New("value out of int range")
 		}
 		ni.Integer, ni.Valid = int(v), true
-		return
 	case []byte:
 		n, err := strconv.Atoi(string(v))
 		if err != nil {
 			return err
 		}
 		ni.Integer, ni.Valid = n, true
-		return nil
 	case string:
 		n, err := strconv.Atoi(v)
 		if err != nil {
 			return err
 		}
 		ni.Integer, ni.Valid = n, true
-		return nil
+	default:
+		ni.Valid = false
+		return fmt.Errorf("Can't convert %T to integer", value)
 	}
-
-	ni.Valid = false
-	return fmt.Errorf("Can't convert %T to integer", value)
+	return nil
 }
 
 // Satisfy sql.Valuer interface.
@@ -78,20 +69,17 @@ func (ni NullInt) Value() (driver.Value, error) {
 }
 
 // Satisfy sql.Scanner interface
-func (nt *NullTime) Scan(value interface{}) (err error) {
-	if value == nil {
-		nt.Time, nt.Valid = time.Time{}, false
-		return
-	}
-
+func (nt *NullTime) Scan(value interface{}) error {
 	switch v := value.(type) {
+	case nil:
+		nt.Time, nt.Valid = time.Time{}, false
 	case time.Time:
 		nt.Time, nt.Valid = v, true
-		return
+	default:
+		nt.Valid = false
+		return fmt.Errorf("Can't convert %T to time.Time", value)
 	}
-
-	nt.Valid = false
-	return fmt.Errorf("Can't convert %T to time.Time", value)
+	return nil
 }
 
 // Satisfy sql.Valuer interface.