SonarCloud reports this problem:
  This branch can not be reached because the condition duplicates a previous condition in the same sequence of "if/else if" statements

Here:

static int
setImageHints(JNIEnv *env, BufImageS_t *srcP, BufImageS_t *dstP,
              int expandICM, int useAlpha,
              int premultiply, mlibHintS_t *hintP)
{
...
                 if (dstCMP->isDefaultCompatCM) {
                    hintP->allocDefaultDst = FALSE;
                    hintP->cvtToDst = FALSE;
                }
                else if (dstCMP->isDefaultCompatCM) { // <---- here
                    hintP->allocDefaultDst = FALSE;
                    hintP->cvtToDst = FALSE;
                }

I wonder if srcCMP->isDefaultCompatCM was meant instead.