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/char/rio/host.h b/drivers/char/rio/host.h
index 23d0681..78f2454 100644
--- a/drivers/char/rio/host.h
+++ b/drivers/char/rio/host.h
@@ -99,7 +99,7 @@
 	struct UnixRup UnixRups[MAX_RUP + LINKS_PER_UNIT];
 	int timeout_id;				/* For calling 100 ms delays */
 	int timeout_sem;			/* For calling 100 ms delays */
-	long locks;				/* long req'd for set_bit --RR */
+	unsigned long locks;			/* long req'd for set_bit --RR */
 	char ____end_marker____;
 };
 #define Control      CardP->DpControl