patch 7.4.836

Problem:    Accessing unitinialized memory.
Solution:   Add missing calls to init_tv(). (Dominique Pelle)

src/eval.c

@@ -5371,6 +5371,8 @@ eval_index(arg, rettv, evaluate, verbose)
     }
 #endif
 
+    init_tv(&var1);
+    init_tv(&var2);
     if (**arg == '.')
     {
 	/*

src/version.c

@@ -741,6 +741,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    836,
 /**/
     835,
 /**/