net: http_server: Avoid directly accessing address of unaligned struct

Use UNALIGNED_MEMBER_ADDR when getting the address of possibly
unaligned structures members instead of attempting to directly
get the address as an offset.

Signed-off-by: Alberto Escolar Piedras <alberto.escolar.piedras@nordicsemi.no>

subsys/net/lib/http/http_server_http2.c

@@ -261,14 +261,14 @@ int send_settings_frame(struct http_client_ctx *client, bool ack)
 		setting = (struct http2_settings_field *)
 			(settings_frame + HTTP2_FRAME_HEADER_SIZE);
 		UNALIGNED_PUT(htons(HTTP2_SETTINGS_HEADER_TABLE_SIZE),
-			      &setting->id);
-		UNALIGNED_PUT(0, &setting->value);
+			      UNALIGNED_MEMBER_ADDR(setting, id));
+		UNALIGNED_PUT(0, UNALIGNED_MEMBER_ADDR(setting, value));
 
 		setting++;
 		UNALIGNED_PUT(htons(HTTP2_SETTINGS_MAX_CONCURRENT_STREAMS),
-			      &setting->id);
+			      UNALIGNED_MEMBER_ADDR(setting, id));
 		UNALIGNED_PUT(htonl(CONFIG_HTTP_SERVER_MAX_STREAMS),
-			      &setting->value);
+			      UNALIGNED_MEMBER_ADDR(setting, value));
 
 		len = HTTP2_FRAME_HEADER_SIZE +
 		      2 * sizeof(struct http2_settings_field);