ata_piix.c: make piix_merge_scr() static

piix_merge_scr() can become static.
Signed-off-by: Adrian Bunk <bunk@kernel.org>
Signed-off-by: Jeff Garzik <jeff@garzik.org>

drivers/ata/ata_piix.c

@@ -1076,7 +1076,7 @@ static void piix_sidpr_write(struct ata_device *dev, unsigned int reg, u32 val)
 	iowrite32(val, hpriv->sidpr + PIIX_SIDPR_DATA);
 }
 
-u32 piix_merge_scr(u32 val0, u32 val1, const int * const *merge_tbl)
+static u32 piix_merge_scr(u32 val0, u32 val1, const int * const *merge_tbl)
 {
 	u32 val = 0;
 	int i, mi;