efi: fix 32bit kernel boot failed problem using efi

3.12 commit 065487a1 ("x86/efi:
Correct EFI boot stub use of code32_start"), upstream commit
7e8213c1 imported a bug, which will
cause 32bit kernel boot to fail using EFI method. It should use the
label's address instead of the value stored in the label to calculate
the address of code32_start.
Signed-off-by: Fupan Li <fupan.li@windriver.com>
Reviewed-by: Matt Fleming <matt.fleming@intel.com>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>

arch/x86/boot/compressed/head_32.S

@@ -54,7 +54,7 @@ ENTRY(efi_pe_entry)
 	call	reloc
 reloc:
 	popl	%ecx
-	subl	reloc, %ecx
+	subl	$reloc, %ecx
 	movl	%ecx, BP_code32_start(%eax)
 
 	sub	$0x4, %esp