These checks use ps(1) with both the '-p' and '-a' flags, which worked
so far as ps(1)'s '-a' option was buggy. Since the fix in commit
"ps(1): Make '-a' and '-A' always show all processes"
(93a94ce731), such a command-line always selects all processes,
making the specified '-p' useless and the test wrong. Remove the
useless '-a'.
While here, remove the redundant '-x', as '-p' implies '-x' by default.
MFC after: 1 day
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D50201
(cherry picked from commit 6463754087)
(cherry picked from commit a69fe62604)
Approved by: re (cperciva)
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2d5e13c86a