dlm_controld: fix may be used uninitialized
    
    This patch fixes the following compiler warning:
    
    config.c:269:26: warning: ‘val’ may be used uninitialized in this function [-Wmaybe-uninitialized]
      269 |    o->file_int = val ? 1 : 0;
    
    The fix just init's val to 0 to have a fallback if parsing fails.