CVE-2025-37775 ksmbd: fix the warning from __kernel_write_iter

In the Linux kernel, the following vulnerability has been resolved: ksmbd: fix the warning from kernelwriteiter 2110.972290 ------------ cut here ------------ 2110.972301 WARNING: CPU: 3 PID: 735 at fs/readwrite.c:599 kernelwriteiter+0x21b/0x280 This patch doesn't allow writing to directory...