patch 8.2.0838: MS-Windows: compiler warning for uninitialized variables

Problem:    MS-Windows: compiler warning for uninitialized variables.
Solution:   Initialize variables.

src/screen.c

@@ -1882,7 +1882,7 @@ screen_stop_highlight(void)
 {
     int	    do_ME = FALSE;	    // output T_ME code
 #if defined(FEAT_VTP) && defined(FEAT_TERMGUICOLORS)
-    int	    do_ME_fg, do_ME_bg;
+    int	    do_ME_fg = FALSE, do_ME_bg = FALSE;
 #endif
 
     if (screen_attr != 0

src/version.c

@@ -746,6 +746,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    838,
 /**/
     837,
 /**/