[evolution-ews] Address a clang warning

[Milan Crha <mcrha src gnome org>]

commit e8ca296b764f2fffaa053cd57eeceeae0fc0d532
Author: Milan Crha <mcrha redhat com>
Date:   Mon May 14 18:20:12 2018 +0200

    Address a clang warning

 src/server/e-ews-item.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/src/server/e-ews-item.c b/src/server/e-ews-item.c
index 48684c2..3caedbe 100644
--- a/src/server/e-ews-item.c
+++ b/src/server/e-ews-item.c
@@ -901,7 +901,7 @@ parse_recur_day_of_week_index (ESoapParameter *param)
        value = e_soap_parameter_get_string_value (param);
        if (!value || !*value) {
                g_free (value);
-               return E_EWS_RECURRENCE_DAYS_OF_WEEK_UNKNOWN;
+               return E_EWS_RECURRENCE_DAY_OF_WEEK_INDEX_UNKNOWN;
        }
 
        /* Do not localize, these are values used in XML */