VS2017 Compiler Warnings in isar_splitrendererpre.c

There are two compiler warnings in ivas-basop\lib_isar\isar_splitrendererpre.c:

ivas-basop\lib_isar\isar_splitrendererpre.c(3049): warning C4456: declaration of 'j' hides previous local declaration
ivas-basop\lib_isar\isar_splitrendererpre.c(2918): note: see declaration of 'j'
ivas-basop\lib_isar\isar_splitrendererpre.c(3057): warning C4456: declaration of 'j' hides previous local declaration
ivas-basop\lib_isar\isar_splitrendererpre.c(2918): note: see declaration of 'j'

Apparently this was introduced with FIX_1119_SPLIT_RENDERING_VOIP, cc @sagnowski