K 10
svn:author
V 7
glebius
K 8
svn:date
V 27
2020-08-20T20:31:47.252721Z
K 7
svn:log
V 338
When we have a command returned by zfs_nextboot() that is longer
than command in the loader.conf, the latter needs to be nul terminated,
otherwise garbage trailer left from zfs_nextboot() will be passed to
parse_cmd() together with loader.conf command.

While here, reset cmd to empty string if read() returns error.

Reviewed by:	tsoome

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