Accept pre-existing rule with invalid name

This patch fixes up a pre-existing rule whose name does not
type-validate with a valid name (typically one without a numeric
prefix in the comment).

Fixes #116
Signed-off-by: Joe Julian <me@joejulian.name>
Fixed dumb logic error
Merge pull request #192 from joejulian/116/pre-existing_rules_name_fix

Accept pre-existing rule with invalid name