[evolution-data-server/wip/mcrha/libical-glib] Address a "may be used uninitialized" compiler warning

[Milan Crha <mcrha src gnome org>]

commit 9df589c502b2cc167c3f2ee54f19015febd683f3
Author: Milan Crha <mcrha redhat com>
Date:   Mon Apr 1 18:44:53 2019 +0200

    Address a "may be used uninitialized" compiler warning

 src/calendar/libedata-cal/e-cal-backend-sexp.c | 2 ++
 1 file changed, 2 insertions(+)
---
diff --git a/src/calendar/libedata-cal/e-cal-backend-sexp.c b/src/calendar/libedata-cal/e-cal-backend-sexp.c
index feafc0b3c..46884d35a 100644
--- a/src/calendar/libedata-cal/e-cal-backend-sexp.c
+++ b/src/calendar/libedata-cal/e-cal-backend-sexp.c
@@ -368,6 +368,8 @@ func_due_in_time_range (ESExp *esexp,
                        due_t = i_cal_time_as_timet_with_zone (e_cal_component_datetime_get_value (dt), zone);
                else
                        due_t = i_cal_time_as_timet (e_cal_component_datetime_get_value (dt));
+       } else {
+               due_t = (time_t) 0;
        }
 
        if (dt && e_cal_component_datetime_get_value (dt) && (due_t <= end && due_t >= start))