Add comment explaining bj is not use when l_data_size == 0

diff --git a/src/lib/openjp2/dwt.c b/src/lib/openjp2/dwt.c
index 43498bdc8f5e432229ae9537875b93434d814c5c..a4ff01ba8f9883f06fd99f00300a39c5a63fd1a0 100644 (file)
--- a/src/lib/openjp2/dwt.c
+++ b/src/lib/openjp2/dwt.c
@@ -409,6 +409,8 @@ static INLINE OPJ_BOOL opj_dwt_encode_procedure(opj_tcd_tilecomp_t * tilec,void
 
        l_data_size = opj_dwt_max_resolution( tilec->resolutions,tilec->numresolutions) * (OPJ_UINT32)sizeof(OPJ_INT32);
        bj = (OPJ_INT32*)opj_malloc((size_t)l_data_size);
+       /* l_data_size is equal to 0 when numresolutions == 1 but bj is not used */
+       /* in that case, so do not error out */
        if (l_data_size != 0 && ! bj) {
                return OPJ_FALSE;
        }