wifi: mt76: mt7925: clean up DMA on probe failure

mainline inclusion
from mainline-v7.2-rc1
category: bugfix

mt7925_pci_probe() initializes DMA before registering the device. If
mt7925_register_device() fails, probe returns through err_free_irq without
tearing down DMA state.

That leaves the TX NAPI instance enabled and skips the DMA queue cleanup
that the normal remove path performs through mt7925e_unregister_device().
Add a dedicated unwind label for failures after mt7925_dma_init() succeeds.

Fixes: c948b5d ("wifi: mt76: mt7925: add Mediatek Wi-Fi7 driver for mt7925 chips")
Co-developed-by: Ijae Kim <ae878000@gmail.com>
Signed-off-by: Ijae Kim <ae878000@gmail.com>
Signed-off-by: Myeonghun Pak <mhun512@gmail.com>
Link: https://patch.msgid.link/20260426143728.41534-1-pakmyeonghun@bagmyeonghun-ui-MacBookPro.local
Signed-off-by: Felix Fietkau <nbd@nbd.name>
(cherry picked from commit 9629f31f505d74e76ac0d7a9492fd06c0316fc5d)
Signed-off-by: Wentao Guan <guanwentao@uniontech.com>

Author: testacegi

drivers/net/wireless/mediatek/mt76/mt7925/pci.c

@@ -410,10 +410,12 @@ static int mt7925_pci_probe(struct pci_dev *pdev,
 
 	ret = mt7925_register_device(dev);
 	if (ret)
-		goto err_free_irq;
+		goto err_free_dma;
 
 	return 0;
 
+err_free_dma:
+	mt792x_dma_cleanup(dev);
 err_free_irq:
 	devm_free_irq(&pdev->dev, pdev->irq, dev);
 err_free_dev: