MFstable/11 r310901:

MFC r310648:

style(9): clean up trailing whitespace

MFC r298450:

Simplify always evaluated branch (`e != NULL`)

- xalloc(..) ensures that e will be non-null via malloc + err.
- `e` is already dereferenced above, so logically it's impossible
to hit the lower test without crashing if it was indeed NULL.

CID: 1007408

Copy head (r256279) to stable/10 as part of the 10.0-RELEASE cycle.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

mdoc: consistently spell our email addresses <foo@FreeBSD.org>

Reviewed by: ru
Approved by: harti

Fix typo in macro name and macro usage.

Found by: make manlint
Reviewed by: ru
Approved by: harti, philip (mentor)

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