patch 8.2.2712: memory leak when adding to a blob fails

Problem:    Memory leak when adding to a blob fails.
Solution:   Clear the second typval before returning.
diff --git a/src/version.c b/src/version.c
index c9632c3..986ad77 100644
--- a/src/version.c
+++ b/src/version.c
@@ -751,6 +751,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    2712,
+/**/
     2711,
 /**/
     2710,