drm/msm/dpu: fix the irq index in dpu_encoder_phys_wb_wait_for_commit_done

Since commit 1e7ac595 ("drm/msm/dpu: pass irq to
dpu_encoder_helper_wait_for_irq()") the
dpu_encoder_phys_wb_wait_for_commit_done expects the IRQ index rather
than the IRQ index in phys_enc->intr table, however writeback got the
older invocation in place. This was unnoticed for several releases, but
now it's time to fix it.

Fixes: d7d0e73f ("drm/msm/dpu: introduce the dpu_encoder_phys_* for writeback")
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Patchwork: https://patchwork.freedesktop.org/patch/550924/
Link: https://lore.kernel.org/r/20230802100426.4184892-2-dmitry.baryshkov@linaro.org

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

@@ -446,7 +446,8 @@ static int dpu_encoder_phys_wb_wait_for_commit_done(
 	wait_info.atomic_cnt = &phys_enc->pending_kickoff_cnt;
 	wait_info.timeout_ms = KICKOFF_TIMEOUT_MS;
 
-	ret = dpu_encoder_helper_wait_for_irq(phys_enc, INTR_IDX_WB_DONE,
+	ret = dpu_encoder_helper_wait_for_irq(phys_enc,
+			phys_enc->irq[INTR_IDX_WB_DONE],
 			dpu_encoder_phys_wb_done_irq, &wait_info);
 	if (ret == -ETIMEDOUT)
 		_dpu_encoder_phys_wb_handle_wbdone_timeout(phys_enc);