sw: remove pointless SolarMutexGuard in SwXTextMarkup::Modify

Change-Id: Ifb96e8194a29bee3a92e2a957f08a5c51584e565

sw/source/core/unocore/unotextmarkup.cxx

@@ -481,10 +481,11 @@ throw (lang::IllegalArgumentException, uno::RuntimeException, std::exception)
 
 void SwXTextMarkup::Impl::Modify( const SfxPoolItem* /*pOld*/, const SfxPoolItem* /*pNew*/ )
 {
+    DBG_TESTSOLARMUTEX();
+
     if ( GetRegisteredIn() )
         GetRegisteredInNonConst()->Remove( this );
 
-    SolarMutexGuard aGuard;
     m_pTxtNode = 0;
 }