MINOR: action: Add function to check rules using an action ACT_ACTION_TRK_*

The function "check_trk_action" has been added to find and check the target
table for rules using an action ACT_ACTION_TRK_*.
diff --git a/src/tcp_rules.c b/src/tcp_rules.c
index d15b153..f259d51 100644
--- a/src/tcp_rules.c
+++ b/src/tcp_rules.c
@@ -773,6 +773,7 @@
 		}
 		rule->arg.trk_ctr.expr = expr;
 		rule->action = ACT_ACTION_TRK_SC0 + args[kw][8] - '0';
+		rule->check_ptr = check_trk_action;
 	}
 	else if (strcmp(args[arg], "expect-proxy") == 0) {
 		if (strcmp(args[arg+1], "layer4") != 0) {