[easytag] Use et_str_empty() in another place

[David King <davidk src gnome org>]

commit 7843de17fbec5781b33c9f3940186912c94ac403
Author: David King <amigadave amigadave com>
Date:   Wed Dec 14 08:57:27 2016 +0000

    Use et_str_empty() in another place

 src/tags/id3v24_tag.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/src/tags/id3v24_tag.c b/src/tags/id3v24_tag.c
index 542181d..fc49520 100644
--- a/src/tags/id3v24_tag.c
+++ b/src/tags/id3v24_tag.c
@@ -902,7 +902,7 @@ libid3tag_Get_Frame_Str (const struct id3_frame *frame,
                 break;
         }
 
-        if (tmpstr && *tmpstr && g_utf8_validate (tmpstr, -1, NULL))
+        if (!et_str_empty (tmpstr) && g_utf8_validate (tmpstr, -1, NULL))
         {
             if (ret)
             {