media: dvb_frontend: fix return values for FE_SET_PROPERTY

There are several problems with regards to the return of
FE_SET_PROPERTY. The original idea were to return per-property
return codes via tvp->result field, and to return an updated
set of values.

However, that never worked. What's actually implemented is:

- the FE_SET_PROPERTY implementation doesn't call .get_frontend
callback in order to get the actual parameters after return;

- the tvp->result field is only filled if there's no error.
So, it is always filled with zero;

- FE_SET_PROPERTY doesn't call memdup_user() nor any other
copy_to_user() function. So, any changes to the properties
will be lost;

- FE_SET_PROPERTY is declared as a write-only ioctl (IOW).

While we could fix the above, it could cause regressions.

So, let's just assume what the code really does, updating
the documentation accordingly and removing the logic that
would update the discarded tvp->result.

Reviewed-by: Shuah Khan <[e-mail]>
Signed-off-by: Mauro Carvalho Chehab <[e-mail]>

Documentation/media/uapi/dvb/fe-get-property.rst

···
 
    -  This call requires read/write access to the device.
 
-   -  At return, the values are updated to reflect the actual parameters
-      used.
+.. note::
+
+   At return, the values aren't updated to reflect the actual
+   parameters used. If the actual parameters are needed, an explicit
+   call to ``FE_GET_PROPERTY`` is needed.
 
 -  ``FE_GET_PROPERTY:``
 

drivers/media/dvb-core/dvb_frontend.c

···
 				kfree(tvp);
 				return err;
 			}
-			(tvp + i)->result = err;
 		}
 		kfree(tvp);
 		break;
···
 				kfree(tvp);
 				return err;
 			}
-			(tvp + i)->result = err;
 		}
 
 		if (copy_to_user((void __user *)tvps->props, tvp,

include/uapi/linux/dvb/frontend.h

···
  * @cmd:	Digital TV command.
  * @reserved:	Not used.
  * @u:		Union with the values for the command.
- * @result:	Result of the command set (currently unused).
+ * @result:	Unused
  *
  * The @u union may have either one of the values below:
  *