It's not actually legal by the C standard to call qsort with a null
authorsimon <simon@cda61777-01e9-0310-a592-d414129be87e>
Thu, 11 Jul 2013 17:24:39 +0000 (17:24 +0000)
committersimon <simon@cda61777-01e9-0310-a592-d414129be87e>
Thu, 11 Jul 2013 17:24:39 +0000 (17:24 +0000)
array pointer, _even_ if you're asking it to sort zero elements so
that in principle it should never dereference that pointer. Fix the
four instances in PSCP/PSFTP where this was previously occurring.

git-svn-id: svn://svn.tartarus.org/sgt/putty@9912 cda61777-01e9-0310-a592-d414129be87e


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