[Bug 43902] New: close() on a closed fd should set errno to EBADF

https://bugs.winehq.org/show_bug.cgi?id=43902

            Bug ID: 43902
           Summary: close() on a closed fd should set errno to EBADF
           Product: Wine
           Version: 2.0.2
          Hardware: x86
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: msvcrt
          Assignee: wine-bugs(a)winehq.org
          Reporter: olly(a)survex.com
      Distribution: ---

Created attachment 59529
  --> https://bugs.winehq.org/attachment.cgi?id=59529
Fix and regression test

Calling close() on an already closed fd should set errno to EBADF - currently
it doesn't set errno at all, which I discovered because it causes Xapian's test
suite to fail when run under wine (one testcase calls close(fd) and checks for
EBADF as a way to confirm that fd has indeed already been closed).

I've attached a patch with a fix and a regression testcase.  It's against
2.0.2, but inspecting the latest code shows the bug to still be present.

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