mdocml: If a .Bd display is on the one hand doomed to be deleted because

mdocml: If a .Bd display is on the one hand doomed to be deleted because

[schwarze]

Log Message:
-----------
If a .Bd display is on the one hand doomed to be deleted because 
it has no type, but is on the other hand breaking another block,
delete its end marker as well, or the end marker may remain behind
as an orphan, triggering an assertion in the terminal formatter.
Problem found by tb@ with afl(1).

Modified Files:
--------------
    mdocml:
        mdoc_validate.c

Revision Data
-------------
Index: mdoc_validate.c
===================================================================
RCS file: /home/cvs/mdocml/mdocml/mdoc_validate.c,v
retrieving revision 1.305
retrieving revision 1.306
diff -Lmdoc_validate.c -Lmdoc_validate.c -u -p -r1.305 -r1.306
--- mdoc_validate.c
+++ mdoc_validate.c
@@ -886,9 +886,10 @@ post_display(POST_ARGS)
 	n = mdoc->last;
 	switch (n->type) {
 	case ROFFT_BODY:
-		if (n->end != ENDBODY_NOT)
-			break;
-		if (n->child == NULL)
+		if (n->end != ENDBODY_NOT) {
+			if (n->tok == MDOC_Bd && n->parent->args == NULL)
+				roff_node_delete(mdoc, n);
+		} else if (n->child == NULL)
 			mandoc_msg(MANDOCERR_BLK_EMPTY, mdoc->parse,
 			    n->line, n->pos, mdoc_macronames[n->tok]);
 		else if (n->tok == MDOC_D1)
--
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