commoncap: use vfs fscaps interfaces

Use the vfs interfaces for fetching file capabilities for killpriv
checks and from get_vfs_caps_from_disk(). While there, update the
kerneldoc for get_vfs_caps_from_disk() to explain how it is different
from vfs_get_fscaps_nosec().

Signed-off-by: Seth Forshee (DigitalOcean) <sforshee@kernel.org>
1 file changed