bootstrap: fix shellcheck warnings
bootstrap: fix shellcheck warnings

Signed-off-by: Patrick Williams <cbb7353e6d953ef360baf960c122346276c6e320@stwcx.xyz>
Change-Id: I86ef079c9632e5563a1a56d6a2e23aad59ecbc57

openbmc/phosphor-objmgr,openbmc/phosphor-objmgr