mt7601u: Remove redundant initialization of variable ret

The variable ret is being initialized with a value that is never read,
it is assigned later on with a different value. The initialization is
redundant and can be removed.

Addresses-Coverity: ("Unused value")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Acked-by: Jakub Kicinski <kubakici@wp.pl>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Link: https://lore.kernel.org/r/20211007234153.31222-1-colin.king@canonical.com

drivers/net/wireless/mediatek/mt7601u/dma.c

@@ -515,7 +515,7 @@ static int mt7601u_alloc_tx(struct mt7601u_dev *dev)
 
 int mt7601u_dma_init(struct mt7601u_dev *dev)
 {
-	int ret = -ENOMEM;
+	int ret;
 
 	tasklet_setup(&dev->tx_tasklet, mt7601u_tx_tasklet);
 	tasklet_setup(&dev->rx_tasklet, mt7601u_rx_tasklet);