mdocml: The code already pays attention not to close the same block

[schwarze@mdocml.bsd.lv]

Log Message:
-----------
The code already pays attention not to close the same block twice.
Similarly, avoid having the same block break two other blocks.
In some situations, this could lead to an endless loop in rew_sub() 
found by jsg@ with afl.  
Minimal example:  .Po Ao Pc Bo Pc Ac Bc

Modified Files:
--------------
    mdocml:
        mdoc_macro.c

Revision Data
-------------
Index: mdoc_macro.c
===================================================================
RCS file: /home/cvs/mdocml/mdocml/mdoc_macro.c,v
retrieving revision 1.160
retrieving revision 1.161
diff -Lmdoc_macro.c -Lmdoc_macro.c -u -p -r1.160 -r1.161
--- mdoc_macro.c
+++ mdoc_macro.c
@@ -363,7 +363,7 @@ rew_dohalt(enum mdoct tok, enum mdoc_typ
 	 * When starting to rewind, skip plain text
 	 * and nodes that have already been rewound.
 	 */
-	if (MDOC_TEXT == p->type || MDOC_VALID & p->flags)
+	if (p->type == MDOC_TEXT || p->flags & (MDOC_VALID | MDOC_BREAK))
 		return(REWIND_MORE);
 
 	/*
@@ -746,7 +746,7 @@ blk_exp_close(MACRO_PROT_ARGS)
 	atok = rew_alt(tok);
 	body = endbody = later = NULL;
 	for (n = mdoc->last; n; n = n->parent) {
-		if (n->flags & MDOC_VALID)
+		if (n->flags & (MDOC_VALID | MDOC_BREAK))
 			continue;
 
 		/* Remember the start of our own body. */
--
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