[coreboot] warnings about shadowed variables

[Stefan Reinauer]

Hi,

besides the Ubuntu breakage, commit 4000 brought a couple of interesting
warnings that were not available before, such as those about the
shadowing of variables. This happens when a global variable is
"overwritten" with a local definition so that the global version is no
longer available in that scope, such as this one:

coreboot-v2-4017/src/arch/i386/boot/multiboot.c: In function
'write_multiboot_info':
coreboot-v2-4017/src/arch/i386/boot/multiboot.c:81: warning: declaration
of 'mbi' shadows a global declaration
coreboot-v2-4017/src/arch/i386/boot/multiboot.c:27: warning: shadowed
declaration is here

If you see these warnings in your builds, please attempt to fix them as
they might mean that your code is accessing the wrong variables..

Stefan

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