[evolution-data-server] Calendar: Fix a possible leak in e_cal_util_parse_ics_string()

[Milan Crha <mcrha src gnome org>]

commit de16f8a8a8ec01caa1b1ea78e79097161507841e
Author: Milan Crha <mcrha redhat com>
Date:   Fri Oct 2 11:38:39 2020 +0200

    Calendar: Fix a possible leak in e_cal_util_parse_ics_string()
    
    When a passed-in string contains more lines than just the iCalendar
    data, then the accumulating string was allocated, but not freed,
    due to missing end line.

 src/calendar/libecal/e-cal-util.c | 3 +++
 1 file changed, 3 insertions(+)
---
diff --git a/src/calendar/libecal/e-cal-util.c b/src/calendar/libecal/e-cal-util.c
index e7b66dd9d..64c3bb54a 100644
--- a/src/calendar/libecal/e-cal-util.c
+++ b/src/calendar/libecal/e-cal-util.c
@@ -223,6 +223,9 @@ e_cal_util_parse_ics_string (const gchar *string)
                g_free (line);
        }
 
+       if (comp_str)
+               g_string_free (comp_str, TRUE);
+
        return icalcomp;
 }