PCI: mediatek: Fix IRQ domain leak when MSI allocation fails

PCI: mediatek: Fix IRQ domain leak when MSI allocation fails

In mtk_pcie_init_irq_domain(), if mtk_pcie_allocate_msi_domains()
fails after port->irq_domain has been successfully created via
irq_domain_create_linear(), the function returns directly without
cleaning up the allocated IRQ domain, resulting in a resource leak.

Add irq_domain_remove() call in the error path to properly release the
INTx IRQ domain before returning the error.

Fixes: 43e6409db64d ("PCI: mediatek: Add MSI support for MT2712 and MT7622")
Signed-off-by: Haotian Zhang <vulab@iscas.ac.cn>
Signed-off-by: Manivannan Sadhasivam <mani@kernel.org>
Link: https://patch.msgid.link/20251119023308.476-1-vulab@iscas.ac.cn