fix issues found with cppcheck static analysis

[ColinIanKing]

Fix some issues found with cppcheck static analysis. Two commits.

Description

1. There are some printf statements using %d for an unsigned integer, use %u for these.
2. Remove redundant less than zero check on a sizet (unsigned) variable.

Affected parts

• [x] library
• [ ] pqos utility
• [ ] rdtset utility
• [ ] App QoS
• [x ] other:example code

Motivation and Contex

Clean up some minor static analysis warnings. Not major bugs, just janitorial clean-ups

How Has This Been Tested?

Just sanity checked with rebuilds with ICC and GCC and re-ran cppcheck.

Types of changes

• [ ] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [X] Janitorial clean up

Checklist:

• [X ] My code follows the code style of this project.
• [ ] My change requires a change to the documentation.
• [ ] I have updated the documentation accordingly.