Changes for AsyncHttpClient#1166.

Author: rlubke

src/main/java/com/ning/http/client/providers/grizzly/HttpTransactionContext.java

@@ -104,7 +104,8 @@ public void onClosed(Closeable closeable, CloseType type) throws IOException {
                 try {
                     closeable.assertOpen();
                 } catch (IOException ioe) {
-                    abort(ioe);
+                    // unwrap the exception as it was wrapped by assertOpen.
+                    abort(ioe.getCause());
                 }
             }
         }