drm/exynos: remove dead code in vidi_power_on

The type of input parameter enable is bool, so it does not need
to check whether true or false.
Signed-off-by: YoungJun Cho <yj44.cho@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: Inki Dae <inki.dae@samsung.com>

drivers/gpu/drm/exynos/exynos_drm_vidi.c

@@ -413,9 +413,6 @@ static int vidi_power_on(struct vidi_context *ctx, bool enable)
 	struct exynos_drm_subdrv *subdrv = &ctx->subdrv;
 	struct device *dev = subdrv->dev;
 
-	if (enable != false && enable != true)
-		return -EINVAL;
-
 	if (enable) {
 		ctx->suspended = false;