fix jtag_cores typo

Original-Author: lekernel
Original-Source: milkymist 96d0e3995ce0c9d7cbb7

     1.1 diff -r 54dd95f89113 -r 27f96ec74b85 jtag_cores.v
     1.2 --- a/jtag_cores.v	Sun Mar 06 19:31:09 2011 +0000
     1.3 +++ b/jtag_cores.v	Sun Mar 06 19:32:57 2011 +0000
     1.4 @@ -27,8 +27,6 @@
     1.5  output jrstn;
     1.6  wire   jrstn;
     1.7  
     1.8 -assign reg_d = 8'hxx;
     1.9 -assign reg_addr_d = 3'bxxx;
    1.10  assign reg_update = 1'b0;
    1.11  assign reg_q = 8'hxx;
    1.12  assign reg_addr_q = 3'bxxx;