[Modify] Polish it

websocket-sharp/Ext.cs

@@ -693,21 +693,17 @@ namespace WebSocketSharp
     {
       var buff = new byte[length];
       var offset = 0;
-      try {
       var nread = 0;
       while (length > 0) {
         nread = stream.Read (buff, offset, length);
         if (nread == 0)
-            break;
+          return buff.SubArray (0, offset);
 
         offset += nread;
         length -= nread;
       }
-      }
-      catch {
-      }
 
-      return buff.SubArray (0, offset);
+      return buff;
     }
 
     internal static byte[] ReadBytes (this Stream stream, long length, int bufferLength)