Improve code with splint

[Lokaltog]

Tried running some of our source code through splint, and it spews out a ton of warnings. Some of these warnings should probably be looked into (buffer overflow issues, possible null pointers, etc). Here's a command that can be run from the project root:

splint [file.c] -I. -I `pkg-config --cflags gtk+-3.0 webkitgtk-3.0`

Output for src/wkline.c
Output for src/wkline/widgets.c

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[nHurD]

Valgrind is another useful tool for checking memory leaks and the like. It also may be a bit disheartening to run at times...

[Lokaltog]

Yep, I've tried to use it a couple of times on wkline. It's pretty annoying to run with webkit, it spits out a ton of warnings and most of them stem from somewhere in the webkit engine.