net/http: remove always true comparison

byte is unsigned so the comparison against zero is always true.

Change-Id: I8fa60245972be362ae920507a291f92c0f9831ad
Reviewed-on: https://go-review.googlesource.com/13941
Run-TryBot: Todd Neal <todd@tneal.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

src/net/http/sniff.go

@@ -209,7 +209,7 @@ func (textSig) match(data []byte, firstNonWS int) string {
 	// c.f. section 5, step 4.
 	for _, b := range data[firstNonWS:] {
 		switch {
-		case 0x00 <= b && b <= 0x08,
+		case b <= 0x08,
 			b == 0x0B,
 			0x0E <= b && b <= 0x1A,
 			0x1C <= b && b <= 0x1F: