drm/vmwgfx/vmwgfx_kms: Remove unused variable 'ret' from 'vmw_du_primary_plane_atomic_check()'

Fixes the following W=1 kernel build warning(s):

 drivers/gpu/drm/vmwgfx/vmwgfx_kms.c: In function ‘vmw_du_primary_plane_atomic_check’:
 drivers/gpu/drm/vmwgfx/vmwgfx_kms.c:460:31: warning: variable ‘vcs’ set but not used [-Wunused-but-set-variable]

Cc: VMware Graphics <linux-graphics-maintainer@vmware.com>
Cc: Roland Scheidegger <sroland@vmware.com>
Cc: David Airlie <airlied@linux.ie>
Cc: Daniel Vetter <daniel@ffwll.ch>
Cc: dri-devel@lists.freedesktop.org
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Zack Rusin <zackr@vmware.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210115181313.3431493-5-lee.jones@linaro.org

drivers/gpu/drm/vmwgfx/vmwgfx_kms.c

@@ -453,10 +453,9 @@ int vmw_du_primary_plane_atomic_check(struct drm_plane *plane,
 
 	if (!ret && new_fb) {
 		struct drm_crtc *crtc = state->crtc;
-		struct vmw_connector_state *vcs;
 		struct vmw_display_unit *du = vmw_crtc_to_du(crtc);
 
-		vcs = vmw_connector_state_to_vcs(du->connector.state);
+		vmw_connector_state_to_vcs(du->connector.state);
 	}