patch 8.0.0983: unnecessary check for NULL pointer

Problem:    Unnecessary check for NULL pointer.
Solution:   Remove the NULL check in dialog_changed(), it already happens in
            dialog_msg(). (Ken Takata)

src/ex_cmds2.c

@@ -1981,9 +1981,7 @@ dialog_changed(
     buf_T	*buf2;
     exarg_T     ea;
 
-    dialog_msg(buff, _("Save changes to \"%s\"?"),
-			(buf->b_fname != NULL) ?
-			buf->b_fname : (char_u *)_("Untitled"));
+    dialog_msg(buff, _("Save changes to \"%s\"?"), buf->b_fname);
     if (checkall)
 	ret = vim_dialog_yesnoallcancel(VIM_QUESTION, NULL, buff, 1);
     else

src/version.c

@@ -769,6 +769,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    983,
 /**/
     982,
 /**/