patch 8.2.0117: crash when using gettabwinvar() with invalid arguments

Problem:    Crash when using gettabwinvar() with invalid arguments. (Yilin
            Yang)
Solution:   Use "curtab" if "tp" is NULL. (closes #5475)
diff --git a/src/version.c b/src/version.c
index 1e79e03..25049a0 100644
--- a/src/version.c
+++ b/src/version.c
@@ -743,6 +743,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    117,
+/**/
     116,
 /**/
     115,