Fileselector entry: fix a case when file was not selected

Expected behavior: when Cancel or X is pressed in Filesector
don't change entry.
Wrong behavior: entry is cleaned.
If no file was selected 'file' variable is NULL,
and elm_entry_utf8_to_markup(NULL) returns empty string.
Thus this empty string was set to entry.

@fix

legacy/elementary/src/lib/elc_fileselector_entry.c

@@ -73,10 +73,10 @@ _FILE_CHOSEN_fwd(void *data,
    const char *file = event_info;
    char *s;
 
+   if (!file) return EINA_TRUE;
    ELM_FILESELECTOR_ENTRY_DATA_GET(data, sd);
 
    s = elm_entry_utf8_to_markup(file);
-   if (!s) return EINA_TRUE;
    elm_object_text_set(sd->entry, s);
    free(s);
    eo_do(data, eo_event_callback_call