K 10
svn:author
V 6
andrew
K 8
svn:date
V 27
2020-06-10T09:31:37.849433Z
K 7
svn:log
V 524
Fix the efi serial console in the Arm models.

On some UEFI implementations the ConsOut EFI variable is not a device
path end type so we never move to the next node. Fix this by always
incrementing the device path node pointer, with a sanity check that
the node length is large enough so no two nodes overlap.

While here return failure on malloc failure rather than a NULL pointer
dereference.

Reviewed by:	tsoome, imp (previous version)
Sponsored by:	Innovate UK
Differential Revision:	https://reviews.freebsd.org/D25202

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