#430: Fix compilation

Author: DmitryNekrasov

core/tzdbOnFilesystem/src/internal/filesystem.kt

@@ -62,8 +62,8 @@ internal fun compareFiles(file1: String, file2: String): Boolean = memScoped {
             val buffer2 = allocArray<ByteVar>(bufferSize)
 
             while (true) {
-                val read1 = fread(buffer1, 1u, bufferSize.toULong(), f1).toInt()
-                val read2 = fread(buffer2, 1u, bufferSize.toULong(), f2).toInt()
+                val read1 = fread(buffer1, 1u, bufferSize.toUInt(), f1).toInt()
+                val read2 = fread(buffer2, 1u, bufferSize.toUInt(), f2).toInt()
 
                 if (read1 != read2) return false
                 if (read1 == 0) break  // EOF