Add a test for ReadFile/WriteFile fault handling, make it pass under
Wine.

diff --git a/dlls/kernel/file.c b/dlls/kernel/file.c
index 342b324..d07f2cf 100644
--- a/dlls/kernel/file.c
+++ b/dlls/kernel/file.c
@@ -449,13 +449,15 @@
 
     status = NtWriteFile(hFile, hEvent, NULL, NULL, piosb,
                          buffer, bytesToWrite, poffset, NULL);
+
+    if (status != STATUS_PENDING && bytesWritten)
+        *bytesWritten = piosb->Information;
+
     if (status)
     {
         SetLastError( RtlNtStatusToDosError(status) );
         return FALSE;
     }
-    if (bytesWritten) *bytesWritten = piosb->Information;
-
     return TRUE;
 }