patch 8.2.4469: Coverity warns for uninitialized variable

Problem:    Coverity warns for uninitialized variable.
Solution:   Set the value to zero.

src/ex_getln.c

@@ -4672,7 +4672,7 @@ get_user_input(
 	    {
 		char_u	*xp_name;
 		int	xp_namelen;
-		long	argt;
+		long	argt = 0;
 
 		// input() with a third argument: completion
 		rettv->vval.v_string = NULL;

src/version.c

@@ -754,6 +754,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    4469,
 /**/
     4468,
 /**/