In the wake of r7415, let's have some better error reporting.
authorsimon <simon@cda61777-01e9-0310-a592-d414129be87e>
Tue, 27 Mar 2007 19:10:10 +0000 (19:10 +0000)
committersimon <simon@cda61777-01e9-0310-a592-d414129be87e>
Tue, 27 Mar 2007 19:10:10 +0000 (19:10 +0000)
Instead of passing -1 to its gotdata and sentdata callbacks on
error, winhandl.c will now pass the negation of the Windows error
number; and the Plink front end will now format that into an error
message and pass it on to the user.

git-svn-id: svn://svn.tartarus.org/sgt/putty@7416 cda61777-01e9-0310-a592-d414129be87e


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