CVE-2026-74326: wifi: mt76: mt7921: fix resource leak in probe error path

In the Linux kernel, the following vulnerability has been resolved:

wifi: mt76: mt7921: fix resource leak in probe error path

When pcimiomapregion() or devmkmemdup() fail, the code returns directly without cleaning up previously allocated resources: - mt76device allocated by mt76allocdevice() - pci irq vectors allocated by pciallocirqvectors() Fix this by jumping to the existing error cleanup path instead of returning directly.