- Remove duplicate call to callout_handle_init() in pcn_attach(). - Conditionalize mtx_destroy() in pcn_attach(). - Assert driver lock in pcn_intr().
- Remove duplicate call to callout_handle_init() in pcn_attach().
- Conditionalize mtx_destroy() in pcn_attach().
- Assert driver lock in pcn_intr().

Submitted by:	 Hiten Pandya <hiten@unixdaemons.com>

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