Coverity scan issues fixes
I fixed a few coverity issues. I guess it would be nice if someone went through those changes and told me which of those should be for example ignored instead.
For example I plan on creating a list of fixes in libkis that a beginner coder could do, adding asserts to pointers, so my list of commits include some of those for libkis.
Test Plan
Every commit is a different issue.
Formalities Checklist
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I confirmed this builds. -
I confirmed Krita ran and the relevant functions work. -
I tested the relevant unit tests and can confirm they are not broken. (If not possible, don't hesitate to ask for help!) -
I made sure my commits build individually and have good descriptions as per KDE guidelines. -
I made sure my code conforms to the standards set in the HACKING file. -
I can confirm the code is licensed and attributed appropriately, and that unattributed code is mine, as per KDE Licensing Policy.