patch 8.2.1896: valgrind warns for using uninitialized memory

Problem:    Valgrind warns for using uninitialized memory.
Solution:   NUL terminate the SmcOpenConnection() error message. (Dominique
            Pellé, closes #7194)
diff --git a/src/version.c b/src/version.c
index e445117..a1ee33e 100644
--- a/src/version.c
+++ b/src/version.c
@@ -751,6 +751,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1896,
+/**/
     1895,
 /**/
     1894,