fclose should return EOF (-1) if an error condition exists.

dlls/msvcrt/file.c

diff --git a/dlls/msvcrt/file.c b/dlls/msvcrt/file.c
index 925e584..c0c4915 100644
--- a/dlls/msvcrt/file.c
+++ b/dlls/msvcrt/file.c
@@ -1195,7 +1195,9 @@
  */
 int MSVCRT_fclose(MSVCRT_FILE* file)
 {
-  return _close(file->_file);
+  int r;
+  r=_close(file->_file);
+  return ((r==MSVCRT_EOF) || (file->_flag & _IOERR) ? MSVCRT_EOF : 0);
 }
 
 /*********************************************************************