mkdir: Suppress extra newline in warning messages

[mknos]

Strings passed to die() and warn() already had an explicit newline, so there's no need for the SIG handlers to add it.

$ perl mkdir -m 0x0 newdir # example die()
mkdir: invalid mode: 0x0
$ perl mkdir -m '' newdir # example warn()
mkdir: invalid mode
$

[coveralls]

Pull Request Test Coverage Report for Build 19848516442

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-1.8%) to 61.202%

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Totals
Change from base Build 19172267834:	-1.8%
Covered Lines:	1863
Relevant Lines:	3044

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💛 - Coveralls