Unused variables

[kylebaron]

   datarecord.cpp:351:7: warning: variable 'start' set but not used [-Wunused-but-set-variable]
     int start = 0;
         ^
   datarecord.cpp:352:7: warning: variable 'end' set but not used [-Wunused-but-set-variable]
     int end = 0;
         ^