Fix bug in filling and handling ipfw's O_DSCP opcode.

Due to integer overflow CS4 token was handled as BE.

PR:		207459
MFC after:	1 week

sbin/ipfw/ipfw2.c

@@ -1029,7 +1029,7 @@ fill_dscp(ipfw_insn *cmd, char *av, int cblen)
 				errx(EX_DATAERR, "Invalid DSCP value");
 		}
 
-		if (code > 32)
+		if (code >= 32)
 			*high |= 1 << (code - 32);
 		else
 			*low |= 1 << code;

sys/netpfil/ipfw/ip_fw2.c

@@ -1711,7 +1711,7 @@ do {								\
 					break;
 
 				/* DSCP bitmask is stored as low_u32 high_u32 */
-				if (x > 32)
+				if (x >= 32)
 					match = *(p + 1) & (1 << (x - 32));
 				else
 					match = *p & (1 << x);