Fix comments. [skip ci]

Yes, the offending set of *BSDs (FreeBSD, DragonFly BSD, and
CupertinoBSD) all do define IPPROTO_PIGP.  And the #defines are
IPPROTO_xxx, not IP_PROTO_xxx.

Author: guyharris

ipproto.h

@@ -65,9 +65,9 @@ extern const char *netdb_protoname (const uint8_t);
  * 88 as "EIGRP" from Cisco.
  *
  * Recent FreeBSD, DragonFly BSD, and macOS <netinet/in.h> headers define
- * IP_PROTO_IGRP as 9 and IP_PROTO_IGRP as 88.  We define IP_PROTO_PIGP
- * ("private interior gateway protocol") as 9 and IP_PROTO_EIGRP as 88;
- * those names* better match what the current protocol number
+ * IPPROTO_PIGP as 9 and IPPROTO_IGRP as 88.  We define IPPROTO_PIGP
+ * ("private interior gateway protocol") as 9 and IPPROTO_EIGRP as 88;
+ * those names better match what the current protocol number
  * assignments say.
  */
 #ifndef IPPROTO_PIGP

print-ip-demux.c

@@ -128,9 +128,9 @@ ip_demux_print(netdissect_options *ndo,
 		 * "EIGRP" from Cisco.
 		 *
 		 * Recent FreeBSD, DragonFly BSD, and macOS <netinet/in.h>
-		 * headers define IP_PROTO_IGRP as 9 and IP_PROTO_IGRP
-		 * as 88.  We define IP_PROTO_PIGP ("private interior
-		 * gateway protocol") as 9 and IP_PROTO_EIGRP as 88;
+		 * headers define IPPROTO_PIGP as 9 and IPPROTO_IGRP
+		 * as 88.  We define IPPROTO_PIGP ("private interior
+		 * gateway protocol") as 9 and IPPROTO_EIGRP as 88;
 		 * those names better match what the current protocol
 		 * number assignments say.
 		 */