[PATCH] ac97_codec: make bitfield unsigned

Make a 1-bit bitfield unsigned (no space for sign bit).
Removes 24 sparse warnings from this one file:
include/linux/ac97_codec.h:262:13: error: dubious one-bit signed bitfield

Signed-off-by: Randy Dunlap <rdunlap@xenotime.net>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

include/linux/ac97_codec.h

@@ -259,7 +259,7 @@ struct ac97_codec {
 	int type;
 	u32 model;
 
-	int modem:1;
+	unsigned int modem:1;
 
 	struct ac97_ops *codec_ops;