dmaengine: ti: k3-navss-udma: fix access to udmax in k3_nav_udmax_release_rx_chn()

The struct k3_nav_udmax_rx_channel->common.udmax has to be checked before
accessing it. Hence move corresponding check to the beginning of the
k3_nav_udmax_release_rx_chn().

Acked-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Signed-off-by: Grygorii Strashko <grygorii.strashko@ti.com>
Signed-off-by: Sekhar Nori <nsekhar@ti.com>

drivers/dma/ti/k3-navss-udma.c

@@ -893,6 +893,9 @@ void k3_nav_udmax_release_rx_chn(struct k3_nav_udmax_rx_channel *rx_chn)
 {
 	int i;
 
+	if (IS_ERR_OR_NULL(rx_chn->common.udmax))
+		return;
+
 	if (rx_chn->psil_paired) {
 		xudma_navss_psil_unpair(rx_chn->common.udmax,
 					rx_chn->common.src_thread,
@@ -900,9 +903,6 @@ void k3_nav_udmax_release_rx_chn(struct k3_nav_udmax_rx_channel *rx_chn)
 		rx_chn->psil_paired = false;
 	}
 
-	if (IS_ERR_OR_NULL(rx_chn->common.udmax))
-		return;
-
 	for (i = 0; i < rx_chn->flow_num; i++)
 		k3_nav_udmax_release_rx_flow(rx_chn, i);