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2022-11-18T21:00:36.485716Z
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dma: use canonical getline() loop

getline() returns -1 on erorr or EOF, so use that condition instead of
feof() and check that there was no error after the loop exits.

Reviewed by:	bapt, kevans (both earlier)
MFC after:	3 weeks
Sponsored by:	The FreeBSD Foundation
Differential Revision:	https://reviews.freebsd.org/D34159

(cherry picked from commit d21e71efce3963b068ccaa807a099b591dc220e9)
(cherry picked from commit 2e8403e0215868a13e2bdd1c979fc351971b8d91)

Git Hash:   166551aa4da5705fa7d58c7aaefbcc472e5cdd03
Git Author: emaste@FreeBSD.org
END