s3: smbd: Locking, fix off-by one calculation in brl_pending_overlap().

s3: smbd: Locking, fix off-by one calculation in brl_pending_overlap().

Consider:

lock = start=110,size=10
pend_lock = 100, size=10

Should not overlap. However,

(lock->start <= pend_lock->start + pend_lock->size)
     110             100                10

is true, so it returns true (overlap).

lock->start <= pend_lock->start + pend_lock->size

should be:

lock->start < pend_lock->start + pend_lock->size

https://bugzilla.samba.org/show_bug.cgi?id=10685

Signed-off-by: Jeremy Allison <jra@samba.org>