cleanup from steve.  i hope i've got all the bits right.

Reference: /n/atom/patch/applied2013/xmlparsenits
Date: Wed Nov 27 00:00:14 CET 2013
Signed-off-by: quanstro@quanstro.net

--- /sys/src/libxml/xmlparse.c	Tue Nov 26 23:59:53 2013
+++ /sys/src/libxml/xmlparse.c	Tue Nov 26 23:59:53 2013
@@ -152,6 +152,7 @@
 	{ "gt",		L'>' },
 	{ "apos",	L'\'' },
 	{ "quot",	L'"' },
+	{ "copy",	L'©' },
 	{ "nbsp",	0xa0 },		/* no-break space */
 };
 
@@ -194,7 +195,9 @@
 		if(memcmp(Entities[i].name, buf, l) == 0)
 			return Entities[i].rune;
 
-	fprint(2, "%d: '&%s;' unknown/unsupported entity reference\n", st->line, buf);
+	for(i = --l; i >= 0; i--)
+		unget(st, buf[i]);
+	fprint(2, "%d: '%s' unknown/unsupported entity reference\n", st->line, buf);
 	return L'?';
 }