ieee1394: sbp2: change some module parameters from int to bool

This is upwards compatible, except that integer values other than 0 or 1
are no longer accepted.  But values like "Y", "N", "no", "nnoooh!" work
now.

Also, improve a comment on the serialize_io parameter and make the
ORB_SET_EXCLUSIVE macro ultra-safe.

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
diff --git a/drivers/ieee1394/sbp2.h b/drivers/ieee1394/sbp2.h
index 44402b9..333a4bb 100644
--- a/drivers/ieee1394/sbp2.h
+++ b/drivers/ieee1394/sbp2.h
@@ -67,7 +67,7 @@
 #define ORB_SET_LUN(v)			((v) & 0xffff)
 #define ORB_SET_FUNCTION(v)		(((v) & 0xf) << 16)
 #define ORB_SET_RECONNECT(v)		(((v) & 0xf) << 20)
-#define ORB_SET_EXCLUSIVE(v)		(((v) & 0x1) << 28)
+#define ORB_SET_EXCLUSIVE(v)		((v) ? 1 << 28 : 0)
 #define ORB_SET_LOGIN_RESP_LENGTH(v)	((v) & 0xffff)
 #define ORB_SET_PASSWD_LENGTH(v)	(((v) & 0xffff) << 16)