CVE-2025-68766 irqchip/mchp-eic: Fix error code in mchp_eic_domain_alloc()

In the Linux kernel, the following vulnerability has been resolved: irqchip/mchp-eic: Fix error code in mchpeicdomainalloc If irqdomaintranslatetwocell sets "hwirq" to = MCHPEICNIRQ 2 then it results in an out of bounds access. The code checks for invalid values, but doesn't set the error code...