CVE-2026-63808 exfat: fix potential use-after-free in exfat_find_dir_entry()

In the Linux kernel, the following vulnerability has been resolved: exfat: fix potential use-after-free in exfatfinddirentry In exfatfinddirentry, the bufferhead obtained from exfatgetdentry is released with brelsebh before the fall-through TYPEEXTEND branch reads the directory entry through ep...