Bug#400955: base 64 decode problems

[Michele Baldessari]

I took a better look at this, and here's an updated
0015_saslutil_decode64_fix:

    if (inlen > 0) {
        /* check for trailing CRLF */
        if (inlen == 2 && in[0] != '\r' && in[1] != '\n') {
            if (saw_equal) {
                return SASL_BADPROT;                                                                                                                                                                                                         
            } else {
                return (SASL_CONTINUE);
            }   
        } else if (inlen == 1 && in[0] != '\r' && in[0] != '\n') {
            if (saw_equal) {
                return SASL_BADPROT;
            } else {
                return (SASL_CONTINUE);
            }   
        }   
   }   

The previous version had "inlen != 2" test which doesn't really make
much sense since we are checking the two next characters, so we need to
guarantee their presence. I also added a second check for trailing of 
single '\r' and '\n' only, which was why it was barfing on my testcase
with sasl-simple-client.

hth,
Michele