PATCH: Null pointer in libftdi when used with libusb-win32 x64 drivers on Win64 systems

["Redirect \"Slash\" NIL" <redirect.slash.nil@xxxxxxxxx>]

Hello all,

I have uncovered the following issue when compiling OpenOCD with libftdi/libusb-win32 on a Windows 64bit system using the WPG System64 (MinGW x64) toolchain.

It is possible for dev->config to be NULL despite dev->descriptor.bNumConfigurations > 0, when trying to access dev->config[0].bConfigurationValue in ftdi_usb_open_dev(). 
This happens when using libusb-win32 on a Win64 platform, which results in a NULL pointer exception.

The attached patch addresses the issue.

Regards,

>NIL:

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patch_libusb-win32_x64.diff
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