Removed unused variable (#9789)

Author: radarhere

src/_imaging.c

@@ -328,7 +328,6 @@ _new_arrow(PyObject *self, PyObject *args) {
     ModeID mode_id;
     int xsize, ysize;
     PyObject *schema_capsule, *array_capsule;
-    PyObject *ret;
 
     if (!PyArg_ParseTuple(
             args, "s(ii)OO", &mode, &xsize, &ysize, &schema_capsule, &array_capsule