BUG/MINOR: http-rules: completely free incorrect TCP rules on error

When a http-request or http-response rule fails to parse, we currently
free only the rule without its contents, which makes ASAN complain.
Now that we have a new function for this, let's completely free the
rule. This relies on this commit:

  MINOR: actions: add new function free_act_rule() to free a single rule

It's probably not needed to backport this since we're on the exit path
anyway.

src/http_rules.c

@@ -163,7 +163,7 @@ struct act_rule *parse_http_req_cond(const char **args, const char *file, int li
 
 	return rule;
  out_err:
-	free(rule);
+	free_act_rule(rule);
 	return NULL;
 }
 
@@ -241,7 +241,7 @@ struct act_rule *parse_http_res_cond(const char **args, const char *file, int li
 
 	return rule;
  out_err:
-	free(rule);
+	free_act_rule(rule);
 	return NULL;
 }
 
@@ -310,7 +310,7 @@ struct act_rule *parse_http_after_res_cond(const char **args, const char *file,
 
 	return rule;
  out_err:
-	free(rule);
+	free_act_rule(rule);
 	return NULL;
 }