usb: idmouse: fix an uninit-value in idmouse_open

In the Linux kernel, the following vulnerability has been resolved:

usb: idmouse: fix an uninit-value in idmouse_open

In idmouse_create_image, if any ftip_command fails, it will

go to the reset label. However, this leads to the data in

bulk_in_buffer[HEADER..IMGSIZE] uninitialized. And the check

for valid image incurs an uninitialized dereference.

Fix this by moving the check before reset label since this

check only be valid if the data after bulk_in_buffer[HEADER]

has concrete data.

Note that this is found by KMSAN, so only kernel compilation

is tested.