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libcam: NULL out freed `ccb.cdm.matches` and `ccb.cdm.patterns` pointers

Description

libcam: NULL out freed ccb.cdm.matches and ccb.cdm.patterns pointers

This is being done to avoid potential double frees with the values.

Differential Revision: D9970
MFC after: 1 week
Reviewed by: imp
Sponsored by: Dell EMC Isilon