patch 8.2.1638: leaking memory when popup filter function can't be called

Problem:    Leaking memory when popup filter function can't be called.
Solution:   Don't return too soon.
diff --git a/src/version.c b/src/version.c
index bad23c5..b9207f5 100644
--- a/src/version.c
+++ b/src/version.c
@@ -755,6 +755,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1638,
+/**/
     1637,
 /**/
     1636,