V4L/DVB (8906): v4l-dvb: fix assorted sparse warnings

Fix sparse warnings. None are serious, but cutting down on these helps find
future serious sparse warnings/errors.

Redid the av7710.c patch based on a suggestion by Oliver Endriss.

Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
diff --git a/drivers/media/dvb/dvb-usb/af9005-remote.c b/drivers/media/dvb/dvb-usb/af9005-remote.c
index ff00c0e..7c596f9 100644
--- a/drivers/media/dvb/dvb-usb/af9005-remote.c
+++ b/drivers/media/dvb/dvb-usb/af9005-remote.c
@@ -25,7 +25,7 @@
  */
 #include "af9005.h"
 /* debug */
-int dvb_usb_af9005_remote_debug;
+static int dvb_usb_af9005_remote_debug;
 module_param_named(debug, dvb_usb_af9005_remote_debug, int, 0644);
 MODULE_PARM_DESC(debug,
 		 "enable (1) or disable (0) debug messages."