fix a memory leak that could occur when signing

when signatures were not added because of too many types already
existing at a node, the diff was not being cleaned up; this led to
a memory leak being reported at shutdown.

diff --git a/lib/dns/zone.c b/lib/dns/zone.c
index 9f152a7c0255f151582f85326f325c306082e1cd..f8c0723ff6bcb4cd26c0d091df28569221809686 100644 (file)
--- a/lib/dns/zone.c
+++ b/lib/dns/zone.c
@@ -9743,6 +9743,7 @@ cleanup:
        }
 
        dns_diff_clear(&_sig_diff);
+       dns_diff_clear(&post_diff);
 
        for (i = 0; i < nkeys; i++) {
                dst_key_free(&zone_keys[i]);