stmmac: display the descriptors if DES0 = 0

It makes sense to display the descriptors even if
DES0 is zero. This helps for example in case of it
is needed to dump rx write-back descriptors to get
timestamp status.
Signed-off-by: NGiuseppe Cavallaro <peppe.cavallaro@st.com>
Cc: Alexandre TORGUE <alexandre.torgue@st.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/ethernet/stmicro/stmmac/dwmac4_descs.c

@@ -347,10 +347,9 @@ static void dwmac4_display_ring(void *head, unsigned int size, bool rx)
 	pr_info("%s descriptor ring:\n", rx ? "RX" : "TX");
 
 	for (i = 0; i < size; i++) {
-		if (p->des0)
-			pr_info("%d [0x%x]: 0x%x 0x%x 0x%x 0x%x\n",
-				i, (unsigned int)virt_to_phys(p),
-				p->des0, p->des1, p->des2, p->des3);
+		pr_info("%d [0x%x]: 0x%x 0x%x 0x%x 0x%x\n",
+			i, (unsigned int)virt_to_phys(p),
+			p->des0, p->des1, p->des2, p->des3);
 		p++;
 	}
 }