Fix ticket #183: valgrind error in CU::isGBiIdxCoded
This issue is related to uninitialized mrgCtx.interDirNeighbours[count] in the function getInterMergeSubPuMvpCand()
This issue is related to uninitialized mrgCtx.interDirNeighbours[count] in the function getInterMergeSubPuMvpCand()