Second blank check with root for non-existent users must never return 1

The commit af0faf66 ("pam_unix: avoid determining if user exists") introduced
a regression where the blank check could return 1 if root had an empty
password hash because in the second case the password hash of root was
used. We now always return 0 in this case.

The issue was found by Johannes Löthberg.

Fixes #284

* modules/pam_unix/support.c (_unix_blankpasswd): Make the loop
to cover the complete blank check so both existing and non existing
cases are identical except for the possible return value.

0 files changed, 0 insertions, 0 deletions