[swift-inspect] stop leaking memory in Windows heap iteration

Author: andrurogerz

tools/swift-inspect/Sources/swift-inspect/WindowsRemoteProcess.swift

@@ -59,7 +59,7 @@ internal final class WindowsRemoteProcess: RemoteProcess {
     }
   }
 
-  static var Free: FreeFunction {
+  static var Free: FreeFunction? {
     return { (_, bytes, _) in
       free(UnsafeMutableRawPointer(mutating: bytes))
     }