Revert "attempt fix of hang on base close, due to solarmutex deadlock on join"

This reverts commit 5b2cb23c.

That did not fix the bug (fdo#47021), but apparently it does cause
problems, such as the failure of the sfx2 DocumentEvents test (that
doesn't crash any more since 228a3f8b);
without the SolarMutexReleaser the test doesn't fail for me.

framework/inc/dispatch/closedispatcher.hxx

@@ -210,7 +210,6 @@ class CloseDispatcher : public css::lang::XTypeProvider
                     during they call us ...
         */
         DECL_LINK( impl_asyncCallback, void* );
-        void doClose();
 
         //---------------------------------------
         /** @short  prepare m_xCloseFrame so it should be closeable without problems.

framework/source/dispatch/closedispatcher.cxx

@@ -282,13 +282,6 @@ void SAL_CALL CloseDispatcher::dispatchWithNotification(const css::util::URL&
                   or shutdown the whole application.
 */
 IMPL_LINK_NOARG(CloseDispatcher, impl_asyncCallback)
-{
-    SolarMutexReleaser aReleaser;
-    doClose();
-    return 0;
-}
-
-void CloseDispatcher::doClose()
 {
     try
     {
@@ -318,7 +311,7 @@ void CloseDispatcher::doClose()
     // frame already dead ?!
     // Nothing to do !
     if (! xCloseFrame.is())
-        return;
+        return 0;
 
     sal_Bool bCloseFrame           = sal_False;
     sal_Bool bEstablishBackingMode = sal_False;
@@ -474,7 +467,7 @@ void CloseDispatcher::doClose()
     {
     }
 
-    return;
+    return 0;
 }
 
 //-----------------------------------------------