* libmisc/age.c: Added brackets and parenthesis.
* libmisc/age.c: Ignore the return value of fclose (file opened
read-only)
* libmisc/age.c: Ignore puts() return value.
* libmisc/age.c: Use exit(EXIT_FAILURE) instead of exit(1).
* libmisc/age.c: Avoid assignments in comparisons.