staging: nvec: remove managed resource from PS2 driver

This basicly reverts commit e534f3e9 (staging:nvec: Introduce the use of
the managed version of kzalloc). Serio struct should never by managed
because it is refcounted. Doing so will lead to a double free oops on module
remove.
Signed-off-by: Marc Dietrich <marvin24@gmx.de>
Fixes: e534f3e9 ("staging:nvec: Introduce the use of the managed version of kzalloc")
Cc: stable <stable@vger.kernel.org> # 3.15+
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/nvec/nvec_ps2.c

@@ -107,7 +107,7 @@ static int nvec_mouse_probe(struct platform_device *pdev)
 	struct nvec_chip *nvec = dev_get_drvdata(pdev->dev.parent);
 	struct serio *ser_dev;
 
-	ser_dev = devm_kzalloc(&pdev->dev, sizeof(struct serio), GFP_KERNEL);
+	ser_dev = kzalloc(sizeof(struct serio), GFP_KERNEL);
 	if (!ser_dev)
 		return -ENOMEM;