[RADEON]: Fix unaligned I/O port access during probe.

The driver does a readl() on DEVICE_ID which is 2-byte aligned and
2-bytes in size. It's doing this read just to flush write buffers.

Create IN16() and OUT16() macros, and use the former to do this I/O
load.

Signed-off-by: David S. Miller <[e-mail]>

drivers/video/aty/radeon_base.c

···
 	 */
 
 	/* Flush PCI buffers ? */
-	tmp = INREG(DEVICE_ID);
+	tmp = INREG16(DEVICE_ID);
 
 	local_irq_disable();
 

drivers/video/aty/radeonfb.h

···
 
 #define INREG8(addr)		readb((rinfo->mmio_base)+addr)
 #define OUTREG8(addr,val)	writeb(val, (rinfo->mmio_base)+addr)
+#define INREG16(addr)		readw((rinfo->mmio_base)+addr)
+#define OUTREG16(addr,val)	writew(val, (rinfo->mmio_base)+addr)
 #define INREG(addr)		readl((rinfo->mmio_base)+addr)
 #define OUTREG(addr,val)	writel(val, (rinfo->mmio_base)+addr)