net: macb: Remove dead code

macb_64b_desc is always called when HW_DMA_CAP_64B is defined.
So the return NULL can never be reached. Remove the dead code.

Signed-off-by: Shubhrajyoti Datta <[e-mail]>
Reviewed-by: Claudiu Beznea <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

drivers/net/ethernet/cadence/macb_main.c

···
 #ifdef CONFIG_ARCH_DMA_ADDR_T_64BIT
 static struct macb_dma_desc_64 *macb_64b_desc(struct macb *bp, struct macb_dma_desc *desc)
 {
-	if (bp->hw_dma_cap & HW_DMA_CAP_64B)
-		return (struct macb_dma_desc_64 *)((void *)desc + sizeof(struct macb_dma_desc));
-	return NULL;
+	return (struct macb_dma_desc_64 *)((void *)desc
+		+ sizeof(struct macb_dma_desc));
 }
 #endif