[media] saa6588: add support for non-blocking mode

saa6588 always blocked while waiting for data, even if the filehandle
was in non-blocking mode.

Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>
diff --git a/include/media/saa6588.h b/include/media/saa6588.h
index 1489a52..b5ec1aa 100644
--- a/include/media/saa6588.h
+++ b/include/media/saa6588.h
@@ -27,6 +27,7 @@
 
 struct saa6588_command {
 	unsigned int  block_count;
+	bool          nonblocking;
 	int           result;
 	unsigned char __user *buffer;
 	struct file   *instance;