Add verilator pragma to suppress BLKLOOPINIT in DelayBuffer.v

rtl/ip/fft/DelayBuffer.v

@@ -17,6 +17,7 @@ reg [WIDTH-1:0] buf_im[0:DEPTH-1];
 integer n;
 
 //  Shift Buffer
+/* verilator lint_off BLKLOOPINIT */
 always @(posedge clock) begin
     for (n = DEPTH-1; n > 0; n = n - 1) begin
         buf_re[n] <= buf_re[n-1];
@@ -25,6 +26,7 @@ always @(posedge clock) begin
     buf_re[0] <= di_re;
     buf_im[0] <= di_im;
 end
+/* verilator lint_on BLKLOOPINIT */
 
 assign  do_re = buf_re[DEPTH-1];
 assign  do_im = buf_im[DEPTH-1];