Kristof Provost b8f7267d49 uma: allow uma_zfree_pcu(..., NULL)
We already allow free(NULL) and uma_zfree(..., NULL). Make
uma_zfree_pcpu(..., NULL) work as well.
This also means that counter_u64_free(NULL) will work.

These make cleanup code simpler.

MFC after:	1 week
Sponsored by:	Rubicon Communications, LLC ("Netgate")
Differential Revision:	https://reviews.freebsd.org/D29189
2021-03-12 12:12:35 +01:00
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