Correct v.blk_on in r.state s_block when gapsize = 0.

libraries/base/diag/src/vhdl/diag_block_gen.vhd

@@ -216,7 +216,7 @@ begin
             if v.eop = '1' and r.blk_en = '0' then
               v.state := s_idle;          -- accept disable after eop, not during block
             end if;
-            if r.eop = '1' then
+            if v.eop = '1' then
               v.blk_xon := xon_reg;  -- accept XOFF after eop, not during block
             end if;