HS20: Fix TrustRoot path for PolicyUpdate node in PPS MO

Incorrect TrustRoot path "PolicyUpdate/TrustRoot" was used. The
TrustRoot path is required to be "Policy/PolicyUpdate/TrustRoot" as
defined in Section 9.1 of Hotspot 2.0 (Release 2) specification. Fix the
path to "Policy/PolicyUpdate/TrustRoot".

Signed-off-by: ASHUTOSH NARAYAN <ashutoshx.narayan@intel.com>

hs20/client/osu_client.c

@@ -397,9 +397,9 @@ static int cmd_dl_polupd_ca(struct hs20_osu_client *ctx, const char *pps_fname,
 	}
 
 	node = get_child_node(ctx->xml, pps,
-			      "PolicyUpdate/TrustRoot");
+			      "Policy/PolicyUpdate/TrustRoot");
 	if (node == NULL) {
-		wpa_printf(MSG_INFO, "No PolicyUpdate/TrustRoot/CertURL found from PPS");
+		wpa_printf(MSG_INFO, "No Policy/PolicyUpdate/TrustRoot/CertURL found from PPS");
 		xml_node_free(ctx->xml, pps);
 		return -1;
 	}