[PATCH] ieee1394: fix cross_bound check for null ISO packets

Fix cross_bound to not return 1 for zero-length regions.  Fixes regression
when sending null ISO packets.

Signed-off-by: Jody McIntyre <scjody@steamballoon.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

drivers/ieee1394/ohci1394.h

@@ -236,6 +236,9 @@ struct ti_ohci {
 
 static inline int cross_bound(unsigned long addr, unsigned int size)
 {
+	if (size == 0)
+		return 0;
+
 	if (size > PAGE_SIZE)
 		return 1;