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/include/linux/agpgart.h b/include/linux/agpgart.h
index bfb8ec7..09fbf7e 100644
--- a/include/linux/agpgart.h
+++ b/include/linux/agpgart.h
@@ -197,7 +197,7 @@
 	struct agp_file_private *next;
 	struct agp_file_private *prev;
 	pid_t my_pid;
-	long access_flags;	/* long req'd for set_bit --RR */
+	unsigned long access_flags;	/* long req'd for set_bit --RR */
 };
 
 struct agp_front_data {