ctl_report_supported_opcodes: Rename invalid label to invalid_options

This error handling is specific to an invalid value in the REPORTING
OPTIONS field of a REPORT SUPPORTED OPERATION CODES command.

While here, reuse the label for another case.

Reviewed by: imp, emaste
Differential Revision: https://reviews.freebsd.org/D46775

(cherry picked from commit 0063ef79f9e6b9ad47969af3b94ae63e7888852c)