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2021-04-08T21:38:08.607682Z
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mount_nullfs: rename a local variable

The "source" variable was introduced in r26072, probably as the
traditional counterpart to "target".  But the "source"/"target" names
suggest the opposite of their actual meaning.  With ln, for example, the
source is the real file and the target is the newly created link.  In
mount_nullfs the meaning is the opposite: the target is the existing
file system and the source is the newly created mountpoint.  Better to
use "target"/"mountpoint" terminology, which matches the man page.

Sponsored by:	Axcient

(cherry picked from commit f540cb27a23719d88b7e5143be6e62f75dd25f08)

Git Hash:   5061d5a0cfaf68a6891db82f6bd26ad3e72e87b1
Git Author: asomers@FreeBSD.org
END