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growfs: do not error if filesystem is already requested size

For some cloud/virtualization use cases it can be convenient to grow the
filesystem on boot any time the disk/partition happens to be larger, but
not fail if it remains the same size.

Continue to emit a message if we have no action to take, but exit with
status 0 if the size remains the same.

Reviewed by:	trasz
MFC after:	1 week
Sponsored by:	The FreeBSD Foundation
Differential Revision:	https://reviews.freebsd.org/D32856

(cherry picked from commit 3f9acedb020b4bcac850eee8a60c75e0880d3e3f)

Git Hash:   11f45b8f800975e0484940430b988b2006caf1e4
Git Author: emaste@FreeBSD.org
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