patch 8.2.0544: memory leak in search test

Problem:    Memory leak in search test.
Solution:   Free msgbuf. (Dominique Pelle, closes #5912)
diff --git a/src/version.c b/src/version.c
index ae324b3..945896d 100644
--- a/src/version.c
+++ b/src/version.c
@@ -739,6 +739,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    544,
+/**/
     543,
 /**/
     542,