updated for version 7.3.316

Problem:    Crash when 'colorcolumn' is set and closing buffer.
Solution:   Check for w_buffer to be NULL. (Yasuhiro Matsumoto)

src/option.c

@@ -7036,6 +7036,9 @@ check_colorcolumn(wp)
     int		i;
     int		j = 0;
 
+    if (wp->w_buffer == NULL)
+	return NULL;  /* buffer was closed */
+
     for (s = wp->w_p_cc; *s != NUL && count < 255;)
     {
 	if (*s == '-' || *s == '+')

src/version.c

@@ -709,6 +709,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    316,
 /**/
     315,
 /**/