Fix warnings and error VC++ compiler

client/mysql.cc:
  Removing unreferenced variables
sql/sql_test.cc:
  Fix VC++ compiler error that doesn't permits the declaration and
  initialization of variables that can be skipped by the prior
  goto end instruction.

client/mysql.cc

@@ -1414,7 +1414,6 @@ static int com_server_help(String *buffer __attribute__((unused)),
     server_cmd= cmd_buf;
   }
 
-  char buff[16], time_buf[32];
   MYSQL_RES *result;
   ulong timer;
   uint error= 0;

sql/sql_test.cc

@@ -276,6 +276,7 @@ static void display_table_locks (void)
     VOID(pthread_mutex_unlock(&lock->mutex));
   }
   VOID(pthread_mutex_unlock(&THR_LOCK_lock));
+  uint i;
   if (!saved_table_locks.elements) goto end;
   
   qsort((gptr) dynamic_element(&saved_table_locks,0,TABLE_LOCK_INFO *),saved_table_locks.elements,sizeof(TABLE_LOCK_INFO),(qsort_cmp) dl_compare);
@@ -283,7 +284,7 @@ static void display_table_locks (void)
 
   puts("\nThread database.table_name          Locked/Waiting        Lock_type\n");
   
-  for (uint i=0 ; i < saved_table_locks.elements ; i++)
+  for (i=0 ; i < saved_table_locks.elements ; i++)
   {
     TABLE_LOCK_INFO *dl_ptr=dynamic_element(&saved_table_locks,i,TABLE_LOCK_INFO*);
     printf("%-8ld%-28.28s%-22s%s\n",