x86: fix comments in vmlinux_64.lds

for bzImage, the vmlinux_64.lds still have s32 bit code, and startup_32
should be 0. fix the comment.

Signed-off-by: Yinghai Lu <yinghai.lu@sun.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
diff --git a/arch/x86/boot/compressed/vmlinux_64.lds b/arch/x86/boot/compressed/vmlinux_64.lds
index f6e5b44..7e5c720 100644
--- a/arch/x86/boot/compressed/vmlinux_64.lds
+++ b/arch/x86/boot/compressed/vmlinux_64.lds
@@ -3,7 +3,7 @@
 ENTRY(startup_64)
 SECTIONS
 {
-	/* Be careful parts of head_64.S assume startup_64 is at
+	/* Be careful parts of head_64.S assume startup_32 is at
 	 * address 0.
 	 */
 	. = 0;