Optimize blinear closed file cleanup logic

shiroha-server/src/main/java/io/nanachiyo0721/shiroha/data/BufferedLinearRegionFile.java

@@ -459,6 +459,9 @@ public class BufferedLinearRegionFile implements io.nanachiyo0721.shiroha.data.R
                         return;
                     }
 
+                    // remove from flusher
+                    this.markClosed();
+
                     IOException failure = null;
 
                     // final sync so no buffered data is lost; holding syncLock also guarantees no
@@ -473,8 +476,6 @@ public class BufferedLinearRegionFile implements io.nanachiyo0721.shiroha.data.R
                     }
 
                     try {
-                        this.markClosed();
-
                         this.swapFileChannel.close();
                     } catch (IOException ex) {
                         if (failure == null) failure = ex;
@@ -488,9 +489,6 @@ public class BufferedLinearRegionFile implements io.nanachiyo0721.shiroha.data.R
                         else failure.addSuppressed(e);
                     }
 
-                    // finalize
-                    this.markClosed();
-
                     if (failure != null) {
                         throw failure;
                     }