Coverity issues since 03.03.2022 [ PART 2 ]

• commit 1 - CID 350171
• commit 2 - CID 350215, CID 350211
• commit 3 - CID 350124, CID 350210
• commit 4 - CID 350143, CID 350232
• commit 5 - CID 248898
• commit 6 - CID 350145
• commit 7 - CID 350169
• commit 8 - CID 350180
• commit 9 - CID 350191
• commit 10 - CID 350204
• commit 11
  • CID 36346
  • CID 248550
  • CID 248822
  • CID 36376
• commit 12
  • CID 350225
  • CID 350131
  • CID 350179
• commit 13 - CID 329498
• commit 14 - CID 36251
• commit 15 - CID 35991

Sum: 23 Coverity issues.

Test Plan

Unit tests before my MR and after.

Formalities Checklist

• 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.