x86, realmode: don't copy real_mode_header

Replaced copying of real_mode_header with a pointer
to beginning of RM memory.

Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@intel.com>
Link: http://lkml.kernel.org/r/1336501366-28617-19-git-send-email-jarkko.sakkinen@intel.com
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
diff --git a/arch/x86/kernel/tboot.c b/arch/x86/kernel/tboot.c
index c136e23..65adda4 100644
--- a/arch/x86/kernel/tboot.c
+++ b/arch/x86/kernel/tboot.c
@@ -202,7 +202,7 @@
 	}
 
 	tboot->acpi_sinfo.kernel_s3_resume_vector =
-		real_mode_header.wakeup_start;
+		real_mode_header->wakeup_start;
 
 	return 0;
 }