patch 8.1.1962: leaking memory when using tagfunc()

Problem:    Leaking memory when using tagfunc().
Solution:   Free the user_data. (Dominique Pelle, closes #4886)
diff --git a/src/version.c b/src/version.c
index 6b30e7c..7fd13b8 100644
--- a/src/version.c
+++ b/src/version.c
@@ -762,6 +762,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1962,
+/**/
     1961,
 /**/
     1960,
diff --git a/src/window.c b/src/window.c
index 6f27c5c..4abceb4 100644
--- a/src/window.c
+++ b/src/window.c
@@ -4892,8 +4892,10 @@
     win_free_lsize(wp);
 
     for (i = 0; i < wp->w_tagstacklen; ++i)
+    {
 	vim_free(wp->w_tagstack[i].tagname);
-
+	vim_free(wp->w_tagstack[i].user_data);
+    }
     vim_free(wp->w_localdir);
 
     /* Remove the window from the b_wininfo lists, it may happen that the