Fix code scanning alert-Incorrect conversion between integer types

[ghostloda]

What type of PR is this? /kind bug

What this PR does / why we need it: Fix code scanning alert-Incorrect conversion between integer types

Which issue(s) this PR fixes: Fixes #549 Fixes #548 Fixes #547

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 0% with 3 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
pkg/util/util.go	0.00%	3 Missing :warning:

Flag	Coverage Δ
unittests	27.44% <0.00%> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
pkg/util/util.go	30.99% <0.00%> (ø)

[wawa0210]

good job 👍