Fix type in PEM+SSH decoder

[sjaeckel]

9b6bf32 changed the type of the length argument of a LTC_SSHDATA_STRING from ulong32 to unsigned long and usage of this wrong type survived multiple re-factors and code moves.

This fixes #669

[karel-m]

I have a confirmation from debian guys that this fix works.

[sjaeckel]

I have a confirmation from debian guys that this fix works.

The following comment comes from DCIT/perl-CryptX#111 (comment)

@gregoa could you please try CryptX-0.081_001?

I haven't been able to find CryptX-0.081_001. Where can I see that release?

The last comment by @gregoa in https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1082952 and the issue resolution tells me that we can't conclude that this PR has been tested, since the official bug resolution still includes the patch by Niko Tyni.

[sjaeckel]

FTR: some relevant links to the debian packages etc.

Package: https://packages.debian.org/sid/libcryptx-perl
Patches of 0.081-2: https://sources.debian.org/patches/libcryptx-perl/0.081-2/

[karel-m]

DCIT/perl-CryptX#111 (comment)

https://metacpan.org/release/MIK/CryptX-0.081_001

[sjaeckel]

DCIT/perl-CryptX#111 (comment)

https://metacpan.org/release/MIK/CryptX-0.081_001

Thanks! After having a third look on the metacpan page I also found out where I can find that development release 🤦

Sorry for the noise.