Cppcheck: reduce variable scope

Change-Id: I5660fe6ddc745894c1e36176f4aa38ad568f09ba
Reviewed-on: https://gerrit.libreoffice.org/60119
Tested-by: Jenkins
Reviewed-by: Mike Kaganski <mike.kaganski@collabora.com>

sal/rtl/byteseq.cxx

@@ -40,14 +40,13 @@ void SAL_CALL rtl_byte_sequence_reference2One(
     sal_Sequence ** ppSequence ) SAL_THROW_EXTERN_C()
 {
     sal_Sequence * pSequence, * pNew;
-    sal_Int32 nElements;
 
     OSL_ENSURE( ppSequence, "### null ptr!" );
     pSequence = *ppSequence;
 
     if (pSequence->nRefCount > 1)
     {
-        nElements = pSequence->nElements;
+        sal_Int32 nElements = pSequence->nElements;
         if (nElements)
         {
             pNew = static_cast<sal_Sequence *>(malloc( SAL_SEQUENCE_HEADER_SIZE + nElements ));