fix for a handful of memory leaks relating to parsing and allocating arbitrary sized vectors from python args.

Vector.dot() was always leaking memory, and would crash if args sizes didnt match.

These errors were introduced with n-dimensional vector support.

also fixed an error with bmesh py api allocation.

source/blender/python/bmesh/bmesh_py_utils.c

@@ -457,6 +457,7 @@ static PyObject *bpy_bm_utils_face_split(PyObject *UNUSED(self), PyObject *args,
 		                        py_vert_a->v, py_vert_b->v,
 		                        (float (*)[3])coords, ncoords,
 		                        &l_new, py_edge_example ? py_edge_example->e : NULL);
+		PyMem_Free(coords);
 	}
 	else {
 		f_new = BM_face_split(bm, py_face->f,