Don't crash on extension update check

We don't need to release the SolarMutex, as we don't own it.

Change-Id: Id0a0ae8d478dc56d0da2ab296f8031e935920c97
diff --git a/uui/source/iahndl.cxx b/uui/source/iahndl.cxx
index f3a801a..36ba504 100644
--- a/uui/source/iahndl.cxx
+++ b/uui/source/iahndl.cxx
@@ -172,7 +172,6 @@ UUIInteractionHelper::handleRequest(
        HandleData aHD(rRequest);
        Link<void*,void> aLink(&aHD,handlerequest);
        Application::PostUserEvent(aLink,this);
        SolarMutexReleaser aReleaser;
        aHD.wait();
        return aHD.bHandled;
    }
@@ -224,7 +223,6 @@ UUIInteractionHelper::getStringFromRequest(
        HandleData aHD(rRequest);
        Link<void*,void> aLink(&aHD,getstringfromrequest);
        Application::PostUserEvent(aLink,this);
        SolarMutexReleaser aReleaser;
        aHD.wait();
        return aHD.m_aResult;
    }