patch 9.0.0189: invalid memory access for text prop without highlight

Problem:    Invalid memory access for text prop without highlight.
Solution:   Check for a valid highlight ID.

src/drawline.c

@@ -1710,6 +1710,7 @@ win_line(
 						  || text_props[tpi].tp_id < 0)
 					  && text_props[tpi].tp_id != -MAXCOL)
 			{
+			    if (pt->pt_hl_id > 0)
 				used_attr = syn_id2attr(pt->pt_hl_id);
 			    text_prop_type = pt;
 			    text_prop_attr =

src/highlight.c

@@ -3504,6 +3504,7 @@ syn_unadd_group(void)
 
 /*
  * Translate a group ID to highlight attributes.
+ * "hl_id" must be valid: > 0, caller must check.
  */
     int
 syn_id2attr(int hl_id)

src/version.c

@@ -735,6 +735,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    189,
 /**/
     188,
 /**/