[usb] Found a bug in usb2.0 core.

[nihq@red.semi.ac.cn]

Dear Rudolf Usselmann:

     After testing your usb2.0 core round and round, I am sure
that there is a bug in your core program.

In usbf_pe.v

assign int_buf1_set =  !buf_sel & buffer_done & int_set_en & !
buf1_not_aloc;
assign int_buf0_set =  buf_sel & buffer_done & int_set_en & !
buf0_not_aloc;

the int_buf1_set and int_buf0_set should be inverted as follow:

assign int_buf0_set =  !buf_sel & buffer_done & int_set_en & !
buf1_not_aloc;
assign int_buf1_set =  buf_sel & buffer_done & int_set_en & !
buf0_not_aloc;

Since buf_sel==1 means that buffer1 is selected.

best regards
Ni Haiqiao
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