add a zfs spa_t change missed in r235329
add a zfs spa_t change missed in r235329

sys/cddl/boot is obviously not under sys/boot...

Pointed out by:	Jan Beich <jbeich@tormail.org>
Pointyhat to:	avg
MFC after:	1 month

jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase