patch 8.2.4569: Coverity warning for not using a return value

Problem:    Coverity warning for not using a return value.
Solution:   Add "(void)".

src/popupwin.c

@@ -3738,7 +3738,7 @@ may_update_popup_mask(int type)
 				{
 				    // compute the position in the buffer line
 				    // from the position in the window
-				    mouse_comp_pos(wp, &line_cp, &col_cp,
+				    (void)mouse_comp_pos(wp, &line_cp, &col_cp,
 							  &lnum, plines_cache);
 				    redrawWinline(wp, lnum);
 				}

src/version.c

@@ -750,6 +750,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    4569,
 /**/
     4568,
 /**/