compiler warning!

when i compile my program, it gives me the following warning:

"fileinfod.c", line 83: warning: statement not reached

would you please give me a suguestion how to fix this warning. Thank you and here is my program:

int main()
{
  int fd, userfd;
  FILE *fp;
  FILE *userfp;
  struct stat buffer;
  time_t rawtime;
  struct tm * ptm;
     
  char input[255];
  int flag;
  char *months[] = {"jan","feb","mar","apr","may","june","july","aug","sep","oct","nov","dec"};
  char *days[] = {"sun","mon","tues","wed","thurs","fri","sat"};
 
  fp = fopen("COMM_FILE", "w+");     /* open COMM_FILE in read.write mode */
  fd = fileno(fp);                   /* create file descriptor from file pointer */
     
  while(1)
  {
    sleep(5);    
    rewind( fp );                    /* rewind shared COMM_FILE */
    lockf( fd, F_LOCK, 0 );          /* lock shared COMM_FILE  */
         
    flag = getc(fp);                  /* get 1st char from COMM_FILE */
    if ( flag == 48)                  /* if char is 0 (ie meant for server */
    {
      printf("Server processing\n");
      fscanf( fp, "%s", input);       /* read data from COMM_FILE to input */
      lockf( fd, F_ULOCK, 0 );        /* unlock COMM_FILE */
     
           
      if ( (userfp = fopen(input, "r")) && (fstat( fileno(userfp), &buffer)) >= 0)  
      {
         rawtime = buffer.st_atime;       /* access file info filename */
         ptm = localtime ( &rawtime );
         rewind(fp);                      /* lock COMM_FILE */
         lockf( fd, F_LOCK, 0);
      /* write access time info back to COMM_FILE with "1" added to beginning for identifier for client */
         fprintf(fp,"1%s last accessed %s %s %02d  %2d:%02d:%02d %2d\n",input,
                     *(days+ptm->tm_wday),
                     *(months+ptm->tm_mon),
                     ptm->tm_mday,ptm->tm_hour, ptm->tm_min,
                     ptm->tm_sec, ptm->tm_year+1900);

         lockf( fd, F_ULOCK, 0);          /* unlock COMM_FILE */
      }
      else                            /* unable to open user input from client */
      {
        rewind(fp);                   /* rewind and lock COMM_FILE */
     lockf( fd, F_LOCK, 0);
     fprintf(fp, "1%s filename not found", input);    /* write response back to COMM_FILE targeted to client */
     lockf( fd, F_ULOCK, 0);
      }                
    }
    else                 /* COMM_FILE contenets not intended for server */
    {
      lockf( fd, F_ULOCK, 0 );    
    }
  }
  return 0;
}