Exim did stdio operations after fclose. This was exposed by a recent
change which nulled out the file handle after the fclose.
+JH/32 Bug 1909: Fix OCSP proof verification for cases where the proof is
+ signed directly by the cert-signing cert, rather than an intermediate
+ OCSP-signing cert. This is the model used by LetsEncrypt.
+
Exim version 4.87
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