made functions void where their return values were never used

[alexknop]

Problem:
There were functions that were declared to return values, but when used in the project, there was no use of the return values.

Solution:
Change these functions to void for now.

[github-actions]

APK file: https://www.kaminsky.me/nc-dev/android-artifacts/14582.apk



To test this change/fix you can simply download above APK file and install and test it in parallel to your existing Nextcloud app.

[github-actions]

Codacy

Lint

Type	master	PR
Warnings	54	54
Errors	3	3

SpotBugs

Category	Base	New
Bad practice	65	65
Correctness	58	58
Dodgy code	294	295
Experimental	1	1
Internationalization	7	7
Malicious code vulnerability	1	1
Multithreaded correctness	7	7
Performance	51	51
Security	18	18
Total	502	503

SpotBugs increased!