patch 8.2.2764: memory leak when default function argument is allocated

Problem:    Memory leak when default function argument is allocated.
Solution:   Free the expression result.
diff --git a/src/version.c b/src/version.c
index 3dee026..6ad07f7 100644
--- a/src/version.c
+++ b/src/version.c
@@ -751,6 +751,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    2764,
+/**/
     2763,
 /**/
     2762,