typos

Fixes #171.
Fixes #172.

R=agl1
https://golang.org/cl/154136

src/pkg/crypto/subtle/constant_time.go

@@ -23,7 +23,7 @@ func ConstantTimeCompare(x, y []byte) int {
 // Its behavior is undefined if v takes any other value.
 func ConstantTimeSelect(v, x, y int) int	{ return ^(v-1)&x | (v-1)&y }
 
-// ConstantTimeByteEq returns 1 if x == x and 0 otherwise.
+// ConstantTimeByteEq returns 1 if x == y and 0 otherwise.
 func ConstantTimeByteEq(x, y uint8) int {
 	z := ^(x ^ y);
 	z &= z >> 4;

src/pkg/encoding/binary/binary_test.go

@@ -81,6 +81,6 @@ little:
 		t.Errorf("Read little-endian: %v", err)
 	}
 	if !reflect.DeepEqual(sl, s) {
-		t.Errorf("Read big-endian:\n\thave %+v\n\twant %+v", sl, s)
+		t.Errorf("Read little-endian:\n\thave %+v\n\twant %+v", sl, s)
 	}
 }