Eliminate warnings

Question

alter session set plsql_warnings = 'enable :all'
alter session set succeeded.
create or replace procedure scott as
l_empno number(10):=7686;
begin
select empno into l_empno from emp where rownum = 1;
if l_empno is not null then
goto b;
end if;
<<b>>
dbms_output.put_line('yahoo');
end;
my procedure successfully complied  with Warnings;
i am getting tthe below warning.
Warning(9,2): PLW-06002: Unreachable code.
i want to eliminate the above warning without disable the  warning.

Answer 1

i am getting tthe below warning.What database are you on?
On my 11.2.0.2 I get just the usual "optional AUTHID" warning:
SQL> alter session set plsql_warnings = 'enable :all'
Session altered.
SQL> select * from v$version where rownum = 1
BANNER                                                                         
Oracle Database 11g Enterprise Edition Release 11.2.0.2.0 - Production         
1 row selected.
SQL> create or replace procedure scott
as
  l_empno   number (10) := 7686;
begin
  select empno
    into l_empno
    from emp
   where rownum = 1;
  if l_empno is not null
  then
    goto b;
  end if;
<<b>>
  dbms_output.put_line ('yahoo');
end scott;
Procedure created.
SQL> show err
Errors for PROCEDURE SCOTT
LINE/COL ERROR                                                           
1/1      PLW-05018: unit SCOTT omitted optional AUTHID clause; default val
         ue DEFINER used