Merge PR #61166 into wip-jcollin-testing-20250918.121206-squid

* refs/pull/61166/head:
	client: Gracefully handle empty pathname for statxat()
	libcephfs.h: Fix API documentation for ceph_statxat
	client: Gracefully handle empty pathname for chownat()

diff --cc src/include/cephfs/libcephfs.h
Simple merge

diff --cc src/libcephfs.cc
Simple merge