FSKit macOS xcode16.4 b1

#FSKit.framework

diff -ruN /Applications/Xcode_16.3.0.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/System/Library/Frameworks/FSKit.framework/Headers/FSVolume.h /Applications/Xcode_16.4.0-beta.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/System/Library/Frameworks/FSKit.framework/Headers/FSVolume.h
--- /Applications/Xcode_16.3.0.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/System/Library/Frameworks/FSKit.framework/Headers/FSVolume.h	2025-03-16 02:06:28
+++ /Applications/Xcode_16.4.0-beta.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/System/Library/Frameworks/FSKit.framework/Headers/FSVolume.h	2025-04-22 06:22:40
@@ -952,7 +952,7 @@
 ///   - name: The new volume name.
 ///   - reply: A block or closure to indicate success or failure. If renaming succeeds, pass an ``FSFileName`` of the new volume name and a `nil` error. If renaming fails, pass the relevant error as the second parameter; FSKit ignores any ``FSFileName`` in this case. For an `async` Swift implementation, there's no reply handler; simply return the ``FSFileName`` or throw an error.
 -(void)setVolumeName:(FSFileName *)name
-        replyHandler:(void(^)(FSFileName *newName,
+        replyHandler:(void(^)(FSFileName * _Nullable newName,
                               NSError * _Nullable error))reply;
 
 @end