Incorrect user string descriptor responses when DMA is enabled

[shadowfox6]

When USB DMA is enabled, the string descriptors are not transmitted properly through the control endpoint. The issue is that the local USB_StrDesc array in USBD_COMPOSITE_GetUsrStringDesc() is not aligned. Also, it is bad form to use a temporary local array outside of the function it is used in.

Note that the global USB_StrDesc array declared in usbd_desc.c is aligned, and so the top-level string descriptors handled by usbd_desc.c are transmitted properly.

To resolve this, either the locally defined USB_StrDesc array should be globally defined with a different name, or you could extern the existing array for direct access in usbd_composite.c.

[shadowfox6]

Using the global USB_StrDesc array in usbd_composite.c did not work for me and caused an abort. Making the local variable in USBD_COMPOSITE_GetUsrStringDesc() global, changing its name to something like USBD_UsrStrDesc and aligning it did work for me.