ANDROID: USB: f_accessory: Check dev pointer before decoding ctrl request

In case of poweroff charging mode, accessory function instance
is not created and due to this, _acc_dev will be NULL. If target
is connected to Accessory dock in poweroff charging mode, there
is a chance dev pointer is accessed, which is NULL. Hence add a
check before processing control request and return error if it is
NULL.

Bug: 141002587
Change-Id: I4f1deb9d764b8c0bd1d7837cbc43a2933167f568
Signed-off-by: Vijayavardhan Vennapusa <vvreddy@codeaurora.org>
Signed-off-by: Jack Pham <jackp@codeaurora.org>
Signed-off-by: Giuliano Procida <gprocida@google.com>