Removed the thrown exception if stream already closed.

Author: childsb

src/main/java/org/apache/hadoop/fs/glusterfs/GlusterFUSEInputStream.java

@@ -180,14 +180,16 @@ public void syncStreams (int bytes) throws IOException {
         }
 
         public synchronized void close () throws IOException {
-                if (closed)
-                        throw new IOException("Stream closed.");
-
                 super.close();
-                if (fsInputStream != null)
-                        fsInputStream.close();
+             
+                if (closed)
+                    return ;
+                
+                if (fsInputStream != null){
+                	fsInputStream.close();
+        		}
+                
                 fuseInputStream.close();
-
                 closed = true;
         }