[evolution] Fix few memory leaks when converting composer text to plain text

[Milan Crha <mcrha src gnome org>]

commit 316c6054e91475ffc8c720cdd779f1df8440fe00
Author: Milan Crha <mcrha redhat com>
Date:   Wed Jan 11 17:02:29 2017 +0100

    Fix few memory leaks when converting composer text to plain text

 .../web-extension/e-editor-dom-functions.c         |    9 ++++++++-
 1 files changed, 8 insertions(+), 1 deletions(-)
---
diff --git a/src/modules/webkit-editor/web-extension/e-editor-dom-functions.c 
b/src/modules/webkit-editor/web-extension/e-editor-dom-functions.c
index 313244b..9c0a13c 100644
--- a/src/modules/webkit-editor/web-extension/e-editor-dom-functions.c
+++ b/src/modules/webkit-editor/web-extension/e-editor-dom-functions.c
@@ -7196,11 +7196,14 @@ process_node_to_plain_text_for_exporting (EEditorPage *editor_page,
                        GRegex *regex;
 
                        content = webkit_dom_node_get_text_content (child);
+                       if (!content)
+                               goto next;
+
                        /* The text nodes with only '\n' are reflected only in
                         * PRE elements, otherwise skip them. */
                        /* FIXME wrong for "white-space: pre", but we don't use
                         * that in editor in our expected DOM structure */
-                       if (strlen (content) == 1 && *content == '\n' &&
+                       if (content[0] == '\n' && content[1] == '\0' &&
                            !WEBKIT_DOM_IS_HTML_PRE_ELEMENT (source)) {
                                g_free (content);
                                skip_node = TRUE;
@@ -7263,6 +7266,9 @@ process_node_to_plain_text_for_exporting (EEditorPage *editor_page,
 
                        g_string_append (buffer, content);
 
+                       g_free (content);
+                       content = NULL;
+
                        goto next;
                }
 
@@ -7449,6 +7455,7 @@ process_node_to_html_for_exporting (EEditorPage *editor_page,
                        NULL);
 
                remove_node (node);
+               g_free (text_content);
        }
        g_clear_object (&collection);