fix silent init file write failure

package/ios/Core/ChunkedRecorder.swift

@@ -56,28 +56,32 @@ extension ChunkedRecorder: AVAssetWriterDelegate {
 
   private func saveInitSegment(_ data: Data) {
     let url = outputURL.appendingPathComponent("init.mp4")
-    save(data: data, url: url)
-    onChunkReady(url: url, type: .initialization)
+    if save(data: data, url: url) {
+      onChunkReady(url: url, type: .initialization)
+    }
   }
 
   private func saveSegment(_ data: Data, report: AVAssetSegmentReport?) {
     let name = "\(chunkIndex).mp4"
     let url = outputURL.appendingPathComponent(name)
-    save(data: data, url: url)
-    let duration = report?
-      .trackReports
-      .filter { $0.mediaType == .video }
-      .first?
-      .duration
-    onChunkReady(url: url, type: .data(index: chunkIndex, duration: duration))
-    chunkIndex += 1
+    if save(data: data, url: url) {
+      let duration = report?
+        .trackReports
+        .filter { $0.mediaType == .video }
+        .first?
+        .duration
+      onChunkReady(url: url, type: .data(index: chunkIndex, duration: duration))
+      chunkIndex += 1
+    }
   }
 
-  private func save(data: Data, url: URL) {
+  private func save(data: Data, url: URL) -> Bool {
     do {
       try data.write(to: url)
+      return true
     } catch {
       ReactLogger.log(level: .error, message: "Unable to write \(url): \(error.localizedDescription)")
+      return false
     }
   }