ksmbd: skip lock-range check on equal size to avoid size==0 underflow

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

ksmbd: skip lock-range check on equal size to avoid size==0 underflow

When size equals the current i_size (including 0), the code used to call

check_lock_range(filp, i_size, size - 1, WRITE), which computes `size - 1`

and can underflow for size==0. Skip the equal case.