Avoid no driver warning in synthesis.

libraries/base/dp/src/vhdl/dp_fifo_core.vhd

@@ -191,6 +191,7 @@ BEGIN
       usedw    => fifo_rd_usedw
     );
     
+    wr_init <= '0';  -- to avoid no driver warning in synthesis
     fifo_wr_usedw <= fifo_rd_usedw;
   END GENERATE;