[PATCH] memtest86+ fix

[Robert Millan]

This fixes boot for memtest86+ (and actually, Linux zImages since they were
all affected).

The problem was that the first code in grub_linux_boot_zimage copied the
payload from  0x100000 to 0x10000.  Since GRUB starts at 0x8200 and is
typicaly more than 8 kiB in size, it'll most likely overwrite part of it.

A bit of reestructuring was necessary to allow grub_dl_unload_all() to happen
unconditionally as first step, since the information on whether this is a
"big linux" was not promptly available.

Comments?

-- 
Robert Millan

<GPLv2> I know my rights; I want my phone call!
<DRM> What use is a phone call, if you are unable to speak?
(as seen on /.)

memtest.diff
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