renice: Avoid segfault if -n flag is given without argument.
Fixes: 65ee0a8495538
MFC after: 1 week
Sponsored by: Klara, Inc.
Reviewed by: kevans
Differential Revision: https://reviews.freebsd.org/D39623
renice: Avoid segfault if -n flag is given without argument. Tags None Referenced Files None Subscribers None
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