snmp_pf: fix pfInterfacesIfRefsState

pfInterfacesIfRefsState was described as 'Null', which upset bsnmpwalk's attempt
to resolve OIDs to symbolic names:

> bsnmpwalk: Error adding leaf pfInterfacesIfRefsState to list

This was done back in d6d3f01e0a, because we don't return this value any
more. Return it to 'Unsigned32', which fixes things, even if we still don't
actually return this value.

While here update the ORGANIZATION to reflect current ownership.

Reviewed by:	philip
MFC after:	2 weeks
Event:		Tokyo Hackathon 202503
Differential Revision:	https://reviews.freebsd.org/D49413

usr.sbin/bsnmpd/modules/snmp_pf/BEGEMOT-PF-MIB.txt

@@ -21,19 +21,17 @@ IMPORTS
 	FROM BEGEMOT-MIB;
 
 begemotPf MODULE-IDENTITY
-    LAST-UPDATED "201003180000Z"
-    ORGANIZATION "NixSys BVBA"
+    LAST-UPDATED "202503190000Z"
+    ORGANIZATION "Alternative Enterprises (HK) Limited"
     CONTACT-INFO
 	    "		Philip Paeps
 
-	     Postal:	NixSys BVBA
-			Louizastraat 14
-			BE-2800 Mechelen
-			Belgium
-
 	     E-Mail:	philip@FreeBSD.org"
     DESCRIPTION
 	    "The Begemot MIB for the pf packet filter."
+    REVISION	"202503190000Z"
+    DESCRIPTION
+		"Reverted pfInterfacesIfRefsState to Unsigned32"
     REVISION	"201003180000Z"
     DESCRIPTION
 		"Modified pfTablesAddrEntry to support IPv6
@@ -583,7 +581,7 @@ PfInterfacesIfEntry ::= SEQUENCE {
     pfInterfacesIfDescr		    OCTET STRING,
     pfInterfacesIfType		    INTEGER,
     pfInterfacesIfTZero		    TimeTicks,
-    pfInterfacesIfRefsState	    Null,
+    pfInterfacesIfRefsState	    Unsigned32,
     pfInterfacesIfRefsRule	    Unsigned32,
     pfInterfacesIf4BytesInPass	    Counter64,
     pfInterfacesIf4BytesInBlock	    Counter64,

usr.sbin/bsnmpd/modules/snmp_pf/pf_tree.def

@@ -107,7 +107,7 @@
                     (2 pfInterfacesIfDescr OCTETSTRING GET)
                     (3 pfInterfacesIfType ENUM ( 0 group 1 instance 2 detached ) GET)
 		    (4 pfInterfacesIfTZero TIMETICKS GET)
-                    (5 pfInterfacesIfRefsState NULL GET)
+                    (5 pfInterfacesIfRefsState UNSIGNED32 GET)
                     (6 pfInterfacesIfRefsRule UNSIGNED32 GET)
                     (7 pfInterfacesIf4BytesInPass COUNTER64 GET)
                     (8 pfInterfacesIf4BytesInBlock COUNTER64 GET)