Pivy: Fix a compiller warning with wrong check

Warning was:
src/3rdParty/Pivy-0.5/coin_wrap.cpp|244969 col 15| warning: comparison of function 'time' not equal to a null pointer is always true [-Wtautological-pointer-compare]
||           if (time != NULL) {
||               ^~~~    ~~~~

This one supposed to be a copy-paste typo.

src/3rdParty/Pivy-0.5/coin_wrap.cpp

@@ -244966,7 +244966,7 @@ SWIGINTERN PyObject *_wrap_SoMFPlane_setValues(PyObject *SWIGUNUSEDPARM(self), P
           SbPlane * plane = NULL;
           PyObject * item = PyList_GetItem(obj3,i);
           SWIG_ConvertPtr(item, (void **) &plane, SWIGTYPE_p_SbPlane, 1);
-          if (time != NULL) {
+          if (plane != NULL) {
             arg4[i] = *plane; 
           }
         }