BatchedDot: fix more bad pointer arithmetic

theano/tensor/basic.py

@@ -3494,7 +3494,9 @@ class BatchedDot(Op):
                     case 0x111: gemm(&N, &N, &Nz1, &Nz2, &Nx2, &a, x, &sx_2, y, &sy_2, &b, z, &sz_2); break;
                     default: PyErr_SetString(PyExc_ValueError, "some matrix has no unit stride"); return 1;
                 };
-                x += Sx[0]; y += Sy[0]; z += Sz[0];
+                x += Sx[0] / type_size;
+                y += Sy[0] / type_size;
+                z += Sz[0] / type_size;
             }
 
             return 0;