If BI_PARM is never set, it's "" and causes
infinite loop (before my PR sent upstream) or
error out (after my PR sent upstream).
Append -b option only if it's valid.
Signed-off-by: Syrone Wong <wong.syrone@gmail.com>
This commit will fix compile warning as below
tmp/.config-package.in:22096:warning: multi-line strings not supported
Signed-off-by: Shuoyao Wang <wong.syrone@gmail.com>