Correct o_rst in comment.

libraries/base/common/src/vhdl/common_areset.vhd

@@ -80,7 +80,7 @@ begin
   -- Pass on synchronized reset with sufficient g_tree_len to ease timing
   -- closure by FF duplication in out_rst tree. Keep rst = '0' to break
   -- combinatorial path with in_rst to ease timing closure in the reset tree
-  -- network. Use g_tree_len = 0 for wire out_rst <= 0_rst, so no reset tree
+  -- network. Use g_tree_len = 0 for wire out_rst <= o_rst, so no reset tree
   -- as in 2009.
   u_pipe : entity work.common_pipeline_sl
   generic map (