v4l: copy_to_user() is not a good method name

Breaks on any target that has copy_to_user() defined as a non-trivial
macro.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/include/media/videobuf-core.h b/include/media/videobuf-core.h
index 9fa09fb..0fa5d59 100644
--- a/include/media/videobuf-core.h
+++ b/include/media/videobuf-core.h
@@ -133,7 +133,7 @@
 				 enum v4l2_memory memory);
 	int (*sync)		(struct videobuf_queue* q,
 				 struct videobuf_buffer *buf);
-	int (*copy_to_user)	(struct videobuf_queue *q,
+	int (*video_copy_to_user)(struct videobuf_queue *q,
 				 char __user *data,
 				 size_t count,
 				 int nonblocking);