[ruby-cvs:73519] nobu:r66418 (trunk): Refine error message for time interval

[nobu at ruby-lang.org]

nobu	2018-12-16 21:55:59 +0900 (Sun, 16 Dec 2018)

  New Revision: 66418

  https://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=revision&revision=66418

  Log:
    Refine error message for time interval
    
    * time.c (time_timespec): Time interval value can be zero, not
      only positive.  [ruby-dev:50709] [Bug #15420]
    
    From: shuujii (Shuji KOBAYASHI) <shuujii at gmail.com>

  Modified files:
    trunk/test/ruby/test_process.rb
    trunk/time.c