vfs: SMB_VFS_GET_COMPRESSION() -> SMB_VFS_FGET_COMPRESSION()

vfs: SMB_VFS_GET_COMPRESSION() -> SMB_VFS_FGET_COMPRESSION()

Now that handle based fdos_mode() is used everywhere we can be sure that we're
also always getting a handle in SMB_VFS_GET_COMPRESSION() so we can now safely
remove the path parameter. :)

Signed-off-by: Ralph Boehme <slow@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>