When we switched to the gpart backend, and provided selection between MBR & GPT, the MBR full-disk init failed to stamp boot1, and results in a boot not found error. This patch fixes the issue.
When we switched to the gpart backend, and provided selection between
MBR & GPT, the MBR full-disk init failed to stamp boot1, and results
in a boot not found error. This patch fixes the issue.

PR:		151990
Submitted by:	Kris Moore

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