sound: oss: rename local change_bits to avoid powerpc bitsops.h definition

This collides with powerpc exported functions from bitops.h.  Rename the
local copy in the oss soundblaster mixer and ad1848 driver.

Signed-off-by: Andy Whitcroft <apw@canonical.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
diff --git a/sound/oss/sb_mixer.c b/sound/oss/sb_mixer.c
index 2039d31..f8f3b7a 100644
--- a/sound/oss/sb_mixer.c
+++ b/sound/oss/sb_mixer.c
@@ -232,7 +232,7 @@
 	return 1;
 }
 
-static void change_bits(sb_devc * devc, unsigned char *regval, int dev, int chn, int newval)
+static void oss_change_bits(sb_devc *devc, unsigned char *regval, int dev, int chn, int newval)
 {
 	unsigned char mask;
 	int shift;
@@ -284,7 +284,7 @@
 		return -EINVAL;
 
 	val = sb_getmixer(devc, regoffs);
-	change_bits(devc, &val, dev, LEFT_CHN, left);
+	oss_change_bits(devc, &val, dev, LEFT_CHN, left);
 
 	if ((*devc->iomap)[dev][RIGHT_CHN].regno != regoffs)	/*
 								 * Change register
@@ -304,7 +304,7 @@
 							 * Read the new one
 							 */
 	}
-	change_bits(devc, &val, dev, RIGHT_CHN, right);
+	oss_change_bits(devc, &val, dev, RIGHT_CHN, right);
 
 	sb_setmixer(devc, regoffs, val);