Use bytes.Equal rather than bytes.Compare ==/!= 0

As recommended by go-staticcheck, but also might be a bit more efficient
for the compiler to implement, since we don't care about which slice of
bytes is greater than the other one.

pgtype/point.go

@@ -40,7 +40,7 @@ func (p Point) PointValue() (Point, error) {
 }
 
 func parsePoint(src []byte) (*Point, error) {
-	if src == nil || bytes.Compare(src, []byte("null")) == 0 {
+	if src == nil || bytes.Equal(src, []byte("null")) {
 		return &Point{}, nil
 	}