V4L/DVB (8103): videodev: fix/improve ioctl debugging

Various ioctl debugging fixes and improvements:

- use %x rather than %d for control IDs and bitmask fields
- make two arrays const
- show the whole control array for the ext_ctrl ioctls
- print pix_fmt for V4L2_BUF_TYPE_VIDEO_OUTPUT
- show full type name rather than an integer
- fix CROPCAP debugging
- fix G/S_TUNER debugging
- show error code in case of an error
- other small cleanups

Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>

include/media/v4l2-dev.h

@@ -59,8 +59,8 @@ enum v4l2_priority v4l2_prio_max(struct v4l2_prio_state *global);
 int v4l2_prio_check(struct v4l2_prio_state *global, enum v4l2_priority *local);
 
 /* names for fancy debug output */
-extern char *v4l2_field_names[];
-extern char *v4l2_type_names[];
+extern const char *v4l2_field_names[];
+extern const char *v4l2_type_names[];
 
 /*  Compatibility layer interface  --  v4l1-compat module */
 typedef int (*v4l2_kioctl)(struct inode *inode, struct file *file,