localboot: Clear register image before using

Using a register image on the stack without initializing it is not a
good idea.

Reported-by: Erwan Velu <erwanaliasr1@gmail.com>
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
Add const qualifiers to loadleys

Signed-off-by: Gene Cumm <gene.cumm@gmail.com>
ldlinux/readconfig.c: remove bail: from do_include()

Signed-off-by: Gene Cumm <gene.cumm@gmail.com>
com32/modules/poweroff.c: fix main()

Wrong prototype; use GCC unused

Signed-off-by: Gene Cumm <gene.cumm@gmail.com>