net: stmmac: remove unused variable in sysfs_display_ring

The u64 x variable in sysfs_display_ring is unused.
This patch remove it.
Signed-off-by: Corentin Labbe <clabbe.montjoie@gmail.com>
Acked-by: Giuseppe Cavallaro <peppe.cavallaro@st.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/stmicro/stmmac/stmmac_main.c

@@ -2893,9 +2893,7 @@ static void sysfs_display_ring(void *head, int size, int extend_desc,
 	struct dma_desc *p = (struct dma_desc *)head;
 
 	for (i = 0; i < size; i++) {
-		u64 x;
 		if (extend_desc) {
-			x = *(u64 *) ep;
 			seq_printf(seq, "%d [0x%x]: 0x%x 0x%x 0x%x 0x%x\n",
 				   i, (unsigned int)virt_to_phys(ep),
 				   le32_to_cpu(ep->basic.des0),
@@ -2904,7 +2902,6 @@ static void sysfs_display_ring(void *head, int size, int extend_desc,
 				   le32_to_cpu(ep->basic.des3));
 			ep++;
 		} else {
-			x = *(u64 *) p;
 			seq_printf(seq, "%d [0x%x]: 0x%x 0x%x 0x%x 0x%x\n",
 				   i, (unsigned int)virt_to_phys(ep),
 				   le32_to_cpu(p->des0), le32_to_cpu(p->des1),