fbdev: nvidiafb: fix build on 32-bit ARCH=um

Now that ARCH=um no longer has IO port accesses, this driver
can no longer build as-is. Make the IO port calls not just
conditional on i386 but also !UML.

Reported-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Helge Deller <deller@gmx.de>

Author: jmberg-intel

drivers/video/fbdev/nvidia/nv_local.h

@@ -80,7 +80,7 @@
      (par)->dmaFree -= ((size) + 1);          \
 }
 
-#if defined(__i386__)
+#if defined(__i386__) && !defined(CONFIG_UML)
 #define _NV_FENCE() outb(0, 0x3D0);
 #else
 #define _NV_FENCE() mb();