[ide] make 1-bit fields unsigned

It's a bit difficult to have a value and a sign bit in a
1-bit field.

Fix (90) boolean/bitfield sparse warnings:
include/linux/ide.h:937:18: warning: dubious one-bit signed bitfield
include/linux/ide.h:939:17: warning: dubious one-bit signed bitfield
Signed-off-by: Randy Dunlap <rddunlap@osdl.org>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>

include/linux/ide.h

@@ -934,9 +934,9 @@ typedef struct hwgroup_s {
 		/* BOOL: protects all fields below */
 	volatile int busy;
 		/* BOOL: wake us up on timer expiry */
-	int sleeping	: 1;
+	unsigned int sleeping	: 1;
 		/* BOOL: polling active & poll_timeout field valid */
-	int polling	: 1;
+	unsigned int polling	: 1;
 		/* current drive */
 	ide_drive_t *drive;
 		/* ptr to current hwif in linked-list */