Input: maplecontrol - remove redundant drvdata resetting

The driver core automatically resets driver data to NULL on probe
failures and device removal, so we can remove it from the driver.

Assisted-by: Antigravity:gemini-3.5-flash
Link: https://patch.msgid.link/20260703-b4-maple-cleanup-v1-10-41e424964da5@gmail.com
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>