optimize: change err == xx to errors.Is(err, xx) (#3991)

core/iox/textlinescanner.go

@@ -2,6 +2,7 @@ package iox
 
 import (
 	"bufio"
+	"errors"
 	"io"
 	"strings"
 )
@@ -30,7 +31,7 @@ func (scanner *TextLineScanner) Scan() bool {
 
 	line, err := scanner.reader.ReadString('\n')
 	scanner.line = strings.TrimRight(line, "\n")
-	if err == io.EOF {
+	if errors.Is(err, io.EOF) {
 		scanner.hasNext = false
 		return true
 	} else if err != nil {

core/stores/redis/hook.go

@@ -122,7 +122,7 @@ func formatError(err error) string {
 	}
 
 	switch {
-	case err == io.EOF:
+	case errors.Is(err, io.EOF):
 		return "eof"
 	case errors.Is(err, context.DeadlineExceeded):
 		return "context deadline"