drm/nouveau/kms/nv50-: Remove (nv_encoder->crtc) checks in ->disable callbacks

Noticed these in both the disable (which we'll be getting rid of in a
moment) and the atomic disable callbacks: both callback types check whether
or not there's actually a CRTC assigned to the given encoder. However, as
->atomic_disable and ->disable will never be called without a CRTC assigned
to the given encoder there's no point in this check. So just remove it.
Signed-off-by: Lyude Paul <lyude@redhat.com>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

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

@@ -474,7 +474,7 @@ nv50_dac_disable(struct drm_encoder *encoder, struct drm_atomic_state *state)
 	struct nouveau_encoder *nv_encoder = nouveau_encoder(encoder);
 	struct nv50_core *core = nv50_disp(encoder->dev)->core;
 	const u32 ctrl = NVDEF(NV507D, DAC_SET_CONTROL, OWNER, NONE);
-	if (nv_encoder->crtc)
+
 	core->func->dac->ctrl(core, nv_encoder->or, ctrl, NULL);
 	nv_encoder->crtc = NULL;
 	nv50_outp_release(nv_encoder);
@@ -1636,13 +1636,11 @@ nv50_sor_disable(struct drm_encoder *encoder,
 	struct nouveau_crtc *nv_crtc = nouveau_crtc(nv_encoder->crtc);
 	struct nouveau_connector *nv_connector =
 		nv50_outp_get_old_connector(nv_encoder, state);
-
-	nv_encoder->crtc = NULL;
-
-	if (nv_crtc) {
 	struct drm_dp_aux *aux = &nv_connector->aux;
 	u8 pwr;
 
+	nv_encoder->crtc = NULL;
+
 	if (nv_encoder->dcb->type == DCB_OUTPUT_DP) {
 		int ret = drm_dp_dpcd_readb(aux, DP_SET_POWER, &pwr);
 
@@ -1657,7 +1655,6 @@ nv50_sor_disable(struct drm_encoder *encoder,
 	nv50_audio_disable(encoder, nv_crtc);
 	nv50_hdmi_disable(&nv_encoder->base.base, nv_crtc);
 	nv50_outp_release(nv_encoder);
-	}
 }
 
 static void
@@ -1894,7 +1891,7 @@ nv50_pior_disable(struct drm_encoder *encoder, struct drm_atomic_state *state)
 	struct nouveau_encoder *nv_encoder = nouveau_encoder(encoder);
 	struct nv50_core *core = nv50_disp(encoder->dev)->core;
 	const u32 ctrl = NVDEF(NV507D, PIOR_SET_CONTROL, OWNER, NONE);
-	if (nv_encoder->crtc)
+
 	core->func->pior->ctrl(core, nv_encoder->or, ctrl, NULL);
 	nv_encoder->crtc = NULL;
 	nv50_outp_release(nv_encoder);