SIGSEV when running while compiling with trunk

[gcarreno]

Describe the bug
When this lib is compiled using Lazarus 2.3.0 and FPC 3.3.1 it gives a SIGSEV when you call:
TQrCode.EncodeText()

The file where it goes boom is QlpQrCode on line 709.

To Reproduce
Steps to reproduce the behavior:

1. Open the FPC Demo project
2. Compile and run using Lazarus 2.3.0 and FPC 3.3.1

Expected behavior
Everything runs with no error.

Environment:

• OS: Linux Ubuntu 20.04 64b
• Compiler Version 3.3.1 with Lazarus 2.3.0
• Package Version: The one from OPM