drm/exynos/vidi: use drm_edid_duplicate()

Don't open code drm_edid_duplicate(). While at it, drop the error
message on allocation failure.
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Inki Dae <inki.dae@samsung.com>

drivers/gpu/drm/exynos/exynos_drm_vidi.c

@@ -308,7 +308,6 @@ static int vidi_get_modes(struct drm_connector *connector)
 {
 	struct vidi_context *ctx = ctx_from_connector(connector);
 	struct edid *edid;
-	int edid_len;
 	int count;
 
 	/*
@@ -320,12 +319,9 @@ static int vidi_get_modes(struct drm_connector *connector)
 		return 0;
 	}
 
-	edid_len = (1 + ctx->raw_edid->extensions) * EDID_LENGTH;
-	edid = kmemdup(ctx->raw_edid, edid_len, GFP_KERNEL);
-	if (!edid) {
-		DRM_DEV_DEBUG_KMS(ctx->dev, "failed to allocate edid\n");
+	edid = drm_edid_duplicate(ctx->raw_edid);
+	if (!edid)
 		return 0;
-	}
 
 	drm_connector_update_edid_property(connector, edid);