drm/msm/dpu: Remove impossible NULL check

Signed-off-by: Rob Clark <robdclark@chromium.org>
Reviewed-by: Jessica Zhang <jesszhan@codeaurora.org>
Link: https://lore.kernel.org/r/20211023160016.3322052-1-robdclark@gmail.comSigned-off-by: Rob Clark <robdclark@chromium.org>

drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c

@@ -187,11 +187,6 @@ static int dpu_crtc_get_crc(struct drm_crtc *crtc)
 	int i = 0;
 	int rc = 0;
 
-	if (!crtc) {
-		DPU_ERROR("Invalid crtc\n");
-		return -EINVAL;
-	}
-
 	crtc_state = to_dpu_crtc_state(crtc->state);
 	crcs = kcalloc(crtc_state->num_mixers, sizeof(*crcs), GFP_KERNEL);