[master] Removed spurious lease_(0) introduced by accident in #3919 marge

src/lib/dhcpsrv/mysql_lease_mgr.cc

@@ -667,7 +667,7 @@ public:
     /// The initialization of the variables here is nonly to satisfy cppcheck -
     /// all variables are initialized/set in the methods before they are used.
     MySqlLease6Exchange() : addr6_length_(0), duid_length_(0),
-                            iaid_(0), lease_(0), lease_type_(0), prefixlen_(0),
+                            iaid_(0), lease_type_(0), prefixlen_(0),
                             pref_lifetime_(0), subnet_id_(0), valid_lifetime_(0),
                             fqdn_fwd_(false), fqdn_rev_(false),
                             hostname_length_(0), hwaddr_length_(0),