text_style: fix text_segment_Copy() when there's no next segment

Signed-off-by: Francois Cartegnie <fcvlcdev@free.fr>

src/misc/text_style.c

@@ -206,7 +206,7 @@ text_segment_t *text_segment_Copy( text_segment_t *p_src )
 {
     text_segment_t *p_dst = NULL, *p_dst0 = NULL;
 
-    while( p_src && p_src->p_next ) {
+    while( p_src ) {
         text_segment_t *p_next = text_segment_New( p_src->psz_text );
         if( p_next )
             p_next->style = text_style_Duplicate( p_src->style );