drm/exynos: fix memory leak to EDID block

drm_get_edid() returns a pointer to an EDID block. The caller
is responsible to free this pointer itself.
Here the pointer gets assigned to the local variable raw_edid.
Therefore it should be freed before the variable goes out of
scope.
Signed-off-by: Egbert Eich <eich@suse.de>
Signed-off-by: Inki Dae <inki.dae@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>

drivers/gpu/drm/exynos/exynos_hdmi.c

@@ -1293,6 +1293,7 @@ static int hdmi_get_edid(void *ctx, struct drm_connector *connector,
 		DRM_DEBUG_KMS("%s : width[%d] x height[%d]\n",
 			(hdata->dvi_mode ? "dvi monitor" : "hdmi monitor"),
 			raw_edid->width_cm, raw_edid->height_cm);
+		kfree(raw_edid);
 	} else {
 		return -ENODEV;
 	}