update to 1.23.0

[lgtm-com[bot]]

This pull request introduces 5 alerts and fixes 7 when merging 1a6c353f97e63ce1df74843ea99cf280da5289fe into 9066cdafa29ac054243a679baded49212661f47b - view on LGTM.com

new alerts:

• 2 for Unsigned comparison to zero
• 1 for Missing header guard
• 1 for Comparison result is always the same
• 1 for FIXME comment

fixed alerts:

• 5 for Empty branch of conditional
• 1 for Missing header guard
• 1 for Comparison result is always the same