x86/efi: Remove unused variable 'efi'

Remove unused variable 'efi', it is never used. This fixes the following
clang build warning:

  arch/x86/boot/compressed/eboot.c:803:2: warning: Value stored to 'efi' is never read

Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Matt Fleming <matt@codeblueprint.co.uk>
Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-efi@vger.kernel.org
Link: http://lkml.kernel.org/r/1466839230-12781-4-git-send-email-matt@codeblueprint.co.uk


Signed-off-by: Ingo Molnar <mingo@kernel.org>