overlapping memcpy for newly allocated destination soon after a
source string shorter than the limit. Found/investigated by KM.
+JH/31 Bug 2886: GnuTLS: Do not free the cached creds on transport connection
+ close; it may be needed for a subsequent connection. This caused a
+ SEGV on primary-MX defer. Found/investigated by Gedalya & Andreas.
+
Exim version 4.95
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