tweak fix warning

tweak fix warning

../plugins/fd/fd_common.h:528:32: warning: format ‘%lld’ expects argument of type ‘long long int’, but argument 3 has type ‘int64_t’ {aka ‘long int’} [-Wformat=]
  528 |       l = fprintf(fp, "time=%lld level=%c key=%s name=%s vollen=%d vol=%s\n",

../plugins/fd/fd_common.h:528:66: warning: format ‘%d’ expects argument of type ‘int’, but argument 7 has type ‘size_t’ {aka ‘long unsigned int’} [-Wformat=]
  528 |       l = fprintf(fp, "time=%lld level=%c key=%s name=%s vollen=%d vol=%s\n",