dmaengine: ti: k3-udma: Remove redundant is_slave_direction() checks

The direction has been already validated in the main callback and there is
no need to check it again in the TR mode handlers for slave_sg and cyclic.

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Link: https://lore.kernel.org/r/20200824120120.9270-1-peter.ujfalusi@ti.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>

drivers/dma/ti/k3-udma.c

@@ -2024,11 +2024,6 @@ udma_prep_slave_sg_tr(struct udma_chan *uc, struct scatterlist *sgl,
 	int num_tr = 0;
 	int tr_idx = 0;
 
-	if (!is_slave_direction(dir)) {
-		dev_err(uc->ud->dev, "Only slave cyclic is supported\n");
-		return NULL;
-	}
-
 	/* estimate the number of TRs we will need */
 	for_each_sg(sgl, sgent, sglen, i) {
 		if (sg_dma_len(sgent) < SZ_64K)
@@ -2400,11 +2395,6 @@ udma_prep_dma_cyclic_tr(struct udma_chan *uc, dma_addr_t buf_addr,
 	unsigned int i;
 	int num_tr;
 
-	if (!is_slave_direction(dir)) {
-		dev_err(uc->ud->dev, "Only slave cyclic is supported\n");
-		return NULL;
-	}
-
 	num_tr = udma_get_tr_counters(period_len, __ffs(buf_addr), &tr0_cnt0,
 				      &tr0_cnt1, &tr1_cnt0);
 	if (num_tr < 0) {