pf: include anchor path when hashing a rule

Otherwise all anchors hash to the same value.

Note this can result in checksum mismatches between pfsynced hosts,
but it has to be sorted out as the previously computed checksum
would fail to indicate changed anchors.

Reviewed by:	kp
Sponsored by:	Rubicon Communications, LLC ("Netgate")

sys/netpfil/pf/pf_ioctl.c

@@ -1260,6 +1260,8 @@ pf_hash_rule(MD5_CTX *ctx, struct pf_krule *rule)
 	PF_MD5_UPD(rule, allow_opts);
 	PF_MD5_UPD(rule, rt);
 	PF_MD5_UPD(rule, tos);
+	if (rule->anchor != NULL)
+		PF_MD5_UPD_STR(rule, anchor->path);
 }
 
 static bool