Broken MQ mixin

[pepelsbey]

@mixin breakpoint($point) {
    @if $point == 2x {
        @media only screen and (-webkit-min-device-pixel-ratio: 1.5),
        only screen and (min-moz-device-pixel-ratio: 1.5),
        only screen and (min-device-pixel-ratio: 1.5) { @content; }
    }
}