We zero the BSS in two places: once in _start() and then
again in yaboot_start(). The second time we actually get
it wrong and zero 1/4 of the BSS (since we subtract two
pointers).
Since this second zeroing is superfluous and buggy, remove
it.
While here, fix the comments in _start. It claims we aren't
clearing the BSS when we are.
Signed-off-by: Anton Blanchard <anton@samba.org> Signed-off-by: Tony Breeds <tony@bakeyournoodle.com>