Fix an ages-old bug in sed(1), which resulted in the absolutely valid

substitution expressions in the form `s,[fooexp],[barexp],;...' treated
as invalid when the third `,' is (_POSIX2_LINE_MAX * N)-th character in
the line.

MFC after:	2 weeks

usr.bin/sed/compile.c

@@ -467,7 +467,7 @@ compile_subst(p, s)
 	int asize, size;
 	u_char ref;
 	char c, *text, *op, *sp;
-	int more = 0;
+	int more = 1;
 
 	c = *p++;			/* Terminator character */
 	if (c == '\0')