net/http, math/big, cmd/internal/gc/big: replaced errors.New(fmt.Sprintf(...))...

net/http, math/big, cmd/internal/gc/big: replaced errors.New(fmt.Sprintf(...)) in favour fmt.Errorf()

Change-Id: I38fc0ab84a374cb9be0234e40665d7cea0e76fc1
Reviewed-on: https://go-review.googlesource.com/8402Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>

src/cmd/internal/gc/big/int.go

@@ -7,7 +7,6 @@
 package big
 
 import (
-	"errors"
 	"fmt"
 	"io"
 	"math/rand"
@@ -813,7 +812,7 @@ func (z *Int) GobDecode(buf []byte) error {
 	}
 	b := buf[0]
 	if b>>1 != intGobVersion {
-		return errors.New(fmt.Sprintf("Int.GobDecode: encoding version %d not supported", b>>1))
+		return fmt.Errorf("Int.GobDecode: encoding version %d not supported", b>>1)
 	}
 	z.neg = b&1 != 0
 	z.abs = z.abs.setBytes(buf[1:])

src/cmd/internal/gc/big/rat.go

@@ -546,7 +546,7 @@ func (z *Rat) GobDecode(buf []byte) error {
 	}
 	b := buf[0]
 	if b>>1 != ratGobVersion {
-		return errors.New(fmt.Sprintf("Rat.GobDecode: encoding version %d not supported", b>>1))
+		return fmt.Errorf("Rat.GobDecode: encoding version %d not supported", b>>1)
 	}
 	const j = 1 + 4
 	i := j + binary.BigEndian.Uint32(buf[j-4:j])

src/math/big/int.go

@@ -7,7 +7,6 @@
 package big
 
 import (
-	"errors"
 	"fmt"
 	"io"
 	"math/rand"
@@ -813,7 +812,7 @@ func (z *Int) GobDecode(buf []byte) error {
 	}
 	b := buf[0]
 	if b>>1 != intGobVersion {
-		return errors.New(fmt.Sprintf("Int.GobDecode: encoding version %d not supported", b>>1))
+		return fmt.Errorf("Int.GobDecode: encoding version %d not supported", b>>1)
 	}
 	z.neg = b&1 != 0
 	z.abs = z.abs.setBytes(buf[1:])

src/math/big/rat.go

@@ -546,7 +546,7 @@ func (z *Rat) GobDecode(buf []byte) error {
 	}
 	b := buf[0]
 	if b>>1 != ratGobVersion {
-		return errors.New(fmt.Sprintf("Rat.GobDecode: encoding version %d not supported", b>>1))
+		return fmt.Errorf("Rat.GobDecode: encoding version %d not supported", b>>1)
 	}
 	const j = 1 + 4
 	i := j + binary.BigEndian.Uint32(buf[j-4:j])

src/net/http/client.go

@@ -390,7 +390,7 @@ func (c *Client) doFollowingRedirects(ireq *Request, shouldRedirect func(int) bo
 			}
 			resp.Body.Close()
 			if urlStr = resp.Header.Get("Location"); urlStr == "" {
-				err = errors.New(fmt.Sprintf("%d response missing Location header", resp.StatusCode))
+				err = fmt.Errorf("%d response missing Location header", resp.StatusCode)
 				break
 			}
 			base = req.URL