entry: Add null safety check in _elm_entry_entry_paste function.

Summary: Add null safety check for the given text.

Reviewers: tasn, woohyun, thiepha, herdsman

Reviewed By: herdsman

Subscribers: thiepha, JackDanielZ

Differential Revision: https://phab.enlightenment.org/D2868

legacy/elementary/src/lib/elm_entry.c

@@ -1376,6 +1376,8 @@ _elm_entry_entry_paste(Evas_Object *obj,
 {
    char *str = NULL;
 
+   if (!entry) return;
+
    ELM_ENTRY_CHECK(obj);
    ELM_ENTRY_DATA_GET(obj, sd);