dmaengine: ep93xx: Fix unsigned compared against 0

An unsigned value can never be negative,
so this test will always evaluate the same way.
In ep93xx_dma_alloc_chan_resources: An unsigned dma_cfg.port's
value is checked against EP93XX_DMA_I2S1 which is 0.

Signed-off-by: Advait Dhamorikar <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Vinod Koul <[e-mail]>

drivers/dma/ep93xx_dma.c

···
 
 	/* Sanity check the channel parameters */
 	if (!edmac->edma->m2m) {
-		if (edmac->dma_cfg.port < EP93XX_DMA_I2S1 ||
-		    edmac->dma_cfg.port > EP93XX_DMA_IRDA)
+		if (edmac->dma_cfg.port > EP93XX_DMA_IRDA)
 			return -EINVAL;
 		if (edmac->dma_cfg.dir != ep93xx_dma_chan_direction(chan))
 			return -EINVAL;