Fix memory leak (missing typelib_TypeDescription_release)

...by radically simplifying TypeToIdlClass().  It is unclear to me why this was
so complicated.  The only mildly plausible reaons would be that the old code
was careful to return null instead of throwing an exception for an unknown type,
but the TypeToIdlClass-call-sites either strongly expect a non-null return value
(by dereferencing it without any further checking) or use OSL_ASSERT or similar
to verify it.  So lets hope this is good.

Change-Id: I3e24eb6117e84c9d33f4c5f0e2fa88da4c4f2c30

basic/source/classes/sbunoobj.cxx

@@ -368,18 +368,7 @@ TYPEINIT1(SbUnoAnyObject,SbxObject)
 // TODO: source out later
 Reference<XIdlClass> TypeToIdlClass( const Type& rType )
 {
-    // register void as default class
-    Reference<XIdlClass> xRetClass;
-    typelib_TypeDescription * pTD = 0;
-    rType.getDescription( &pTD );
-
-    if( pTD )
-    {
-        OUString sOWName( pTD->pTypeName );
-        Reference< XIdlReflection > xRefl = getCoreReflection_Impl();
-        xRetClass = xRefl->forName( sOWName );
-    }
-    return xRetClass;
+    return getCoreReflection_Impl()->forName(rType.getTypeName());
 }
 
 // Exception type unknown