gadget: NULL pointer dereference

[Yang Rui Rui <ruirui.r.yang@xxxxxxxxx>]

Hi,

I got an oops with gadget CDC ethernet built-in. It is caused by
    see below code:
        switch (gadget->speed) {
        case USB_SPEED_SUPER:
                descriptors = f->ss_descriptors;
                break;
        case USB_SPEED_HIGH:
                descriptors = f->hs_descriptors;
                break;
        default:
        descriptors = f->descriptors;
        }
    
        #### oops here
        for (; *descriptors; ++descriptors) {
        ####
    
    gadget->speed = USB_SPEED_HIGH but f->hs_descriptor is NULL

I fix it by seting the speed as the speed of config functions.
This might be a temporary workaround for me, not sure if it is the
right fix.

I use a linux-omap tree (added some archos gpl driver for their gen8 devices)

Please take a look the fix patch at:
http://gitorious.org/archos-a101-linux-omap/archos-a101-linux-omap/commit/915d027577a36b361274ceb19430d4abdcae40cd

--
Thanks
Yang Ruirui
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