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2021-04-15T19:23:32.747440Z
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setclassenvironment: trim leading spaces in variable names

Trim leading spaces in variable names when the list is e.g.
pretty-formatted in /etc/login.conf or ~/.login_conf.

PR:		247947
Reviewed by:	allanjude
Differential Revision:	https://reviews.freebsd.org/D25649

(cherry picked from commit eeaf9d562fe137e0c52b8c346742dccfc8bde015)

Git Hash:   913a9cc33ea55538f2c3366016f79f4b2a79e3d0
Git Author: yuripv@FreeBSD.org
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