i386: Fix broken mmiocfg accesses

Commit 3320ad99 broke mmio config space
accesses totally on i386 - it dropped the "reg" offset to the address.

Cc: dean gaudet <dean@arctic.org>
Cc: Andi Kleen <ak@suse.de>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

arch/i386/pci/mmconfig.c

@@ -115,13 +115,13 @@ static int pci_mmcfg_write(unsigned int seg, unsigned int bus,
 
 	switch (len) {
 	case 1:
-		mmio_config_writeb(mmcfg_virt_addr, value);
+		mmio_config_writeb(mmcfg_virt_addr + reg, value);
 		break;
 	case 2:
-		mmio_config_writew(mmcfg_virt_addr, value);
+		mmio_config_writew(mmcfg_virt_addr + reg, value);
 		break;
 	case 4:
-		mmio_config_writel(mmcfg_virt_addr, value);
+		mmio_config_writel(mmcfg_virt_addr + reg, value);
 		break;
 	}
 	spin_unlock_irqrestore(&pci_config_lock, flags);