CVE-2026-31737 net: ftgmac100: fix ring allocation unwind on open failure

In the Linux kernel, the following vulnerability has been resolved: net: ftgmac100: fix ring allocation unwind on open failure ftgmac100allocrings allocates rxskbs, txskbs, rxdes, txdes, and rxscratch in stages. On intermediate failures it returned -ENOMEM directly, leaking resources allocated...