drm: Remove now pointelss blob->data casts

Now that blob->data is void* again we don't need the casts anymore.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180223192506.29992-2-ville.syrjala@linux.intel.com
Reviewed-by: Shashank Sharma <shashank.sharma@intel.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>

drivers/gpu/drm/drm_atomic.c

@@ -391,8 +391,7 @@ int drm_atomic_set_mode_prop_for_crtc(struct drm_crtc_state *state,
 	if (blob) {
 		if (blob->length != sizeof(struct drm_mode_modeinfo) ||
 		    drm_mode_convert_umode(state->crtc->dev, &state->mode,
-		                           (const struct drm_mode_modeinfo *)
-		                            blob->data))
+					   blob->data))
 			return -EINVAL;
 
 		state->mode_blob = drm_property_blob_get(blob);