file: -f option doesn't work properly

[mknos]

• Non-standard option -f takes a path argument to read a list of paths to check
• Problem1: "file -f 0" is valid but incorrect truth check did not recognise -f
• Problem2: lines read from file are terminated by newlines, and these newlines were incorrectly being added into ARGV as part of the string (resulting in open() failure)

  %cat 0
  comm
  ar
  %perl file -f 0
  comm: executable /usr/bin/perl script text
  ar: executable /usr/bin/perl script text

[coveralls]

Pull Request Test Coverage Report for Build 11495019829

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-0.7%) to 73.069%

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Totals
Change from base Build 11491874432:	-0.7%
Covered Lines:	350
Relevant Lines:	479

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💛 - Coveralls

[briandfoy]

changes: -f works properly by checking the definedness of its argument instead of truthiness, and chomps the lines it reads.