internal/logger: fix keysAndValues overflow
internal/logger: fix keysAndValues overflow

The limit should not have the "equal" part, since it moves in pairs and the
last element should be n-1 instead of n.

Signed-off-by: Bruno Meneguele <82c7731bc2625bcbab88bc571aee6631ba3f66f3@redhat.com>

zaquestion/lab,zaquestion/lab