CVE-2024-27047: net: phy: fix phy_get_internal_delay accessing an empty array

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

net: phy: fix phygetinternaldelay accessing an empty array

The phygetinternaldelay function could try to access to an empty array in the case that the driver is calling phygetinternaldelay without defining delayvalues and rx-internal-delay-ps or tx-internal-delay-ps is defined to 0 in the device-tree. This will lead to "unable to handle kernel NULL pointer dereference at virtual address 0". To avoid this kernel oops, the test should be delay = 0. As there is already delay < 0 test just before, the test could only be size == 0.