Propagate null gstring through string_catn()

[exim.git] / src / src / dkim_transport.c

diff --git a/src/src/dkim_transport.c b/src/src/dkim_transport.c
index c09c5059b871e5477204ababd9202a4b650f363b..146faff36112c3997de063edad1380f1745b7958 100644 (file)
--- a/src/src/dkim_transport.c
+++ b/src/src/dkim_transport.c
@@ -169,7 +169,7 @@ if (!(dkim_signature = dkim_exim_sign(deliver_datafile, SPOOL_DATA_START_OFFSET,
 #ifdef EXPERIMENTAL_ARC
 if (dkim->arc_signspec)                        /* Prepend ARC headers */
   {
-  uschar * e;
+  uschar * e = NULL;
   if (!(dkim_signature = arc_sign(dkim->arc_signspec, dkim_signature, &e)))
     {
     *err = e;