[evolution] Fix some maybe uninitialized variable usages

[Milan Crha <mcrha src gnome org>]

commit 08ea44f51b5c99bfba09b904d3cb648219462930
Author: Milan Crha <mcrha redhat com>
Date:   Wed Mar 13 17:14:25 2019 +0100

    Fix some maybe uninitialized variable usages
    
    Shown with -O3 in CFLAGS.

 src/e-util/e-name-selector-entry.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)
---
diff --git a/src/e-util/e-name-selector-entry.c b/src/e-util/e-name-selector-entry.c
index b7db7be0b9..bd09abc5aa 100644
--- a/src/e-util/e-name-selector-entry.c
+++ b/src/e-util/e-name-selector-entry.c
@@ -1549,7 +1549,8 @@ insert_unichar (ENameSelectorEntry *name_selector_entry,
 
                /* We do this so we can avoid disturbing destinations with completed contacts
                 * either before or after the destination being inserted. */
-               get_range_at_position (text, *pos, &start_pos, &end_pos);
+               if (!get_range_at_position (text, *pos, &start_pos, &end_pos))
+                       return 0;
                if (*pos <= start_pos)
                        at_start = TRUE;
                if (*pos >= end_pos)
@@ -2937,8 +2938,8 @@ popup_activate_inline_expand (ENameSelectorEntry *name_selector_entry,
        }
 
        text = gtk_entry_get_text (GTK_ENTRY (name_selector_entry));
-       get_range_at_position (text, position, &start, &end);
-       gtk_editable_delete_text (GTK_EDITABLE (name_selector_entry), start, end);
+       if (get_range_at_position (text, position, &start, &end))
+               gtk_editable_delete_text (GTK_EDITABLE (name_selector_entry), start, end);
        gtk_editable_insert_text (GTK_EDITABLE (name_selector_entry), sanitized_text->str, -1, &start);
        g_string_free (sanitized_text, TRUE);