[coreboot] v3 stage1 warnings

[Myles Watson]

This patch removes an unused variable, adds a necessary cast, and moves a
declaration into an #ifdef.


It removes these warnings:
/home/myles/buildrom/try/buildrom/buildrom-devel/work/coreboot-v3/svn/arch/x86/stage1.c:
In function 'stage1_phase1':
/home/myles/buildrom/try/buildrom/buildrom-devel/work/coreboot-v3/svn/arch/x86/stage1.c:173:
warning: unused variable 'me'
/home/myles/buildrom/try/buildrom/buildrom-devel/work/coreboot-v3/svn/arch/x86/stage1.c:
In function 'stage1_phase3':
/home/myles/buildrom/try/buildrom/buildrom-devel/work/coreboot-v3/svn/arch/x86/stage1.c:308:
warning: assignment makes pointer from integer without a cast
/home/myles/buildrom/try/buildrom/buildrom-devel/work/coreboot-v3/svn/arch/x86/stage1.c:282:
warning: unused variable 'ret'

Signed-off-by: Myles Watson <mylesgw at gmail.com>

Thanks,
Myles
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