Check that the credentials are valid as early as possible.
Check that the credentials are valid as early as possible.

Patch by: Vlad Georgescu <vgeorgescu@gmail.com>

* subversion/libsvn_ra_svn/sasl_auth.c:
  (handle_interact): Don't check that the 'creds' variable is non-NULL here.
  (svn_ra_svn__do_auth): Instead do it here, right after the call to
   sasl_auth_next_credentials().

jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion