[evolution-ews] M!4 - Ignore the return value of g_string_append()

[Milan Crha <mcrha src gnome org>]

commit 1a71c3ddbf9952e46462576581d6b4d5463a952b
Author: Дилян Палаузов <git-dpa aegee org>
Date:   Sun Jul 7 16:38:02 2019 +0000

    M!4 - Ignore the return value of g_string_append()
    
    Calling “x = g_string_append (x, y)” is equivalent to
    “g_string_append (x, y)”.
    
    Closes https://gitlab.gnome.org/GNOME/evolution-ews/merge_requests/4

 src/addressbook/ews-oab-decoder.c | 2 +-
 src/camel/camel-ews-utils.c       | 4 ++--
 2 files changed, 3 insertions(+), 3 deletions(-)
---
diff --git a/src/addressbook/ews-oab-decoder.c b/src/addressbook/ews-oab-decoder.c
index 155aec98..baa8628e 100644
--- a/src/addressbook/ews-oab-decoder.c
+++ b/src/addressbook/ews-oab-decoder.c
@@ -442,7 +442,7 @@ ews_oab_read_upto (GInputStream *is,
 
                len = get_pos (c, size, stop);
                if (len)
-                       str = g_string_append_len (str, c, len);
+                       g_string_append_len (str, c, len);
 
                g_free (c);
 
diff --git a/src/camel/camel-ews-utils.c b/src/camel/camel-ews-utils.c
index 4bc9565c..6ab4c73b 100644
--- a/src/camel/camel-ews-utils.c
+++ b/src/camel/camel-ews-utils.c
@@ -695,9 +695,9 @@ form_recipient_list (EEwsConnection *cnc,
                if (!str)
                        str = g_string_new ("");
                else
-                       str = g_string_append (str, ", ");
+                       g_string_append (str, ", ");
 
-               str = g_string_append (str, mb_str);
+               g_string_append (str, mb_str);
 
                g_free (mb_str);
        }