Fix port of file-acl errno checking to non-GNU
I had misinterpreted the private email from Ashish Shukla. * src/fileio.c (Ffile_acl): Fix typo in previous change by negating the call to acl_errno_valid.
I had misinterpreted the private email from Ashish Shukla. * src/fileio.c (Ffile_acl): Fix typo in previous change by negating the call to acl_errno_valid.