long vs. unsigned long - low-hanging fruits in drivers

deal with signedness of the stuff passed to set_bit() et.al.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

drivers/isdn/hisax/hisax.h

@@ -202,7 +202,7 @@ struct Layer1 {
 	void *hardware;
 	struct BCState *bcs;
 	struct PStack **stlistp;
-	long Flags;
+	unsigned long Flags;
 	struct FsmInst l1m;
 	struct FsmTimer	timer;
 	void (*l1l2) (struct PStack *, int, void *);