usb: typec: ucsi: Fix the return value of ucsi_run_command()

The command execution routines need to return the amount of
data that was transferred when succesful.

This fixes an issue where the alternate modes and the power
delivery capabilities are not getting registered.

Fixes: 5e9c1662 ("usb: typec: ucsi: rework command execution functions")
Signed-off-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Link: https://lore.kernel.org/r/20240809150343.286942-1-heikki.krogerus@linux.intel.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/typec/ucsi/ucsi.c

@@ -137,7 +137,7 @@ static int ucsi_run_command(struct ucsi *ucsi, u64 command, u32 *cci,
 	if (ret)
 		return ret;
 
-	return err;
+	return err ?: UCSI_CCI_LENGTH(*cci);
 }
 
 static int ucsi_read_error(struct ucsi *ucsi, u8 connector_num)