x86: early_ioremap_reset fix

This patch fixes a bug of early_ioremap_reset.
Signed-off-by: NHuang Ying <ying.huang@intel.com>
Signed-off-by: NIngo Molnar <mingo@elte.hu>
Signed-off-by: NThomas Gleixner <tglx@linutronix.de>

arch/x86/mm/ioremap_32.c

@@ -247,7 +247,7 @@ void __init early_ioremap_reset(void)
 	unsigned long *pte, phys, addr;
 
 	after_paging_init = 1;
-	for (idx = FIX_BTMAP_BEGIN; idx <= FIX_BTMAP_END; idx--) {
+	for (idx = FIX_BTMAP_BEGIN; idx >= FIX_BTMAP_END; idx--) {
 		addr = fix_to_virt(idx);
 		pte = early_ioremap_pte(addr);
 		if (!*pte & _PAGE_PRESENT) {