fix warning unused function

apps/n2o_sample/src/n2o_sample.erl

@@ -5,7 +5,7 @@
 -include_lib("kvs/include/user.hrl").
 
 main(A)    -> mad:main(A).
-start()    -> start(normal,[]).
+%start()    -> start(normal,[]).
 start(_,_) -> supervisor:start_link({local, n2o_sample}, n2o_sample,[]).
 stop(_)    -> ok.