net: mvneta: zero Tx descriptors on init

Make the initialization sequence consistent with the Linux kernel
driver.

Reviewed-by: Stefan Roese <sr@denx.de>
Acked-by: Joe Hershberger <joe.hershberger@ni.com>
Signed-off-by: Rabeeh Khoury <rabeeh@solid-run.com>
Signed-off-by: Baruch Siach <baruch@tkos.co.il>

drivers/net/mvneta.c

@@ -1708,6 +1708,7 @@ static int mvneta_probe(struct udevice *dev)
 		buffer_loc.tx_descs = (struct mvneta_tx_desc *)bd_space;
 		size = roundup(MVNETA_MAX_TXD * sizeof(struct mvneta_tx_desc),
 				ARCH_DMA_MINALIGN);
+		memset(buffer_loc.tx_descs, 0, size);
 		buffer_loc.rx_descs = (struct mvneta_rx_desc *)
 			((phys_addr_t)bd_space + size);
 		size += roundup(MVNETA_MAX_RXD * sizeof(struct mvneta_rx_desc),