Memory errors reported by valgrind for gdebi-gtk

[Elias Rudberg]

This is for gdebi version 0.9.5.7+nmu2.

When running gdebi-gtk through valgrind, for example like this:

valgrind gdebi-gtk -h

that shows lots of memory errors, for example:
- Conditional jump or move depends on uninitialised value(s)
- Use of uninitialised value of size 8
- Invalid read of size 4
- Address 0x4e68020 is 304 bytes inside a block of size 2,208 free'd

and so on. So there are bugs in the code that can cause the program to crash.
One example of a used that got a crash is here:
https://askubuntu.com/questions/1131516/gdebi-gtk-segmentation-fault-core-dumped