complete preparations for files uploading via posts

targets/telegram/publication/server/src/jvmMain/kotlin/dev/inmo/postssystem/targets/telegram/publication/server/PublicationTargetTelegram.kt

@@ -22,8 +22,7 @@ class PublicationTargetTelegram(
 ) : PublicationTarget {
     override suspend fun publish(post: PublicationPost) {
         post.content.mapNotNull {
-            val content = it.content
-            when (content) {
+            when (val content = it.content) {
                 is BinaryContent -> {
                     val storageFile by lazy {
                         StorageFile(content.filename.name, content.inputProvider().readBytes()).asMultipartFile()