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>
diff --git a/drivers/isdn/hisax/hisax_if.h b/drivers/isdn/hisax/hisax_if.h
index 4898fce..aa7c940 100644
--- a/drivers/isdn/hisax/hisax_if.h
+++ b/drivers/isdn/hisax/hisax_if.h
@@ -56,7 +56,7 @@
 	struct IsdnCardState *cs;
 	struct hisax_b_if *b_if[2];
 	struct sk_buff_head erq;
-	long ph_state;
+	unsigned long ph_state;
 };
 
 int hisax_register(struct hisax_d_if *hisax_if, struct hisax_b_if *b_if[],