K 10
svn:author
V 6
emaste
K 8
svn:date
V 27
2017-11-10T21:26:44.409749Z
K 7
svn:log
V 486
boot1: avoid using NULL device path

As of r323063 boot1 printed out the path & device from which it was
loaded, but uboot's EFI implementation lacked some support, resulting in
a NULL pointer and a crash.  Check for a NULL pointer and avoid
reporting (and storing in the environment) the device and path in this
case.

Submitted by:	Zakary Nafziger <worldofzak@gmail.com>
MFC after:	1 week
Sponsored by:	The FreeBSD Foundation
Differential Revision:	https://reviews.freebsd.org/D13038

END