drm/nouveau/kms/nv50: remove set but not unused variable 'nv_connector'

drivers/gpu/drm/nouveau/dispnv50/disp.c: In function nv50_pior_enable:
drivers/gpu/drm/nouveau/dispnv50/disp.c:1672:28: warning:
 variable nv_connector set but not used [-Wunused-but-set-variable]

commit ac2d9275 ("drm/nouveau/kms/nv50-: Store the
bpc we're using in nv50_head_atom") left behind this.
Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: YueHaibing <yuehaibing@huawei.com>
Reviewed-by: Lyude Paul <lyude@redhat.com>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

drivers/gpu/drm/nouveau/dispnv50/disp.c

@@ -1669,7 +1669,6 @@ nv50_pior_enable(struct drm_encoder *encoder)
 {
 	struct nouveau_encoder *nv_encoder = nouveau_encoder(encoder);
 	struct nouveau_crtc *nv_crtc = nouveau_crtc(encoder->crtc);
-	struct nouveau_connector *nv_connector;
 	struct nv50_head_atom *asyh = nv50_head_atom(nv_crtc->base.state);
 	struct nv50_core *core = nv50_disp(encoder->dev)->core;
 	u8 owner = 1 << nv_crtc->index;
@@ -1677,7 +1676,6 @@ nv50_pior_enable(struct drm_encoder *encoder)
 
 	nv50_outp_acquire(nv_encoder);
 
-	nv_connector = nouveau_encoder_connector_get(nv_encoder);
 	switch (asyh->or.bpc) {
 	case 10: asyh->or.depth = 0x6; break;
 	case  8: asyh->or.depth = 0x5; break;