Use standard validation function

Author: jepler

shared-bindings/busio/I2C.c

@@ -344,9 +344,7 @@ STATIC mp_obj_t busio_i2c_writeto_then_readfrom(size_t n_args, const mp_obj_t *p
     int32_t in_start = args[ARG_in_start].u_int;
     const int32_t in_end = args[ARG_in_end].u_int;
     normalize_buffer_bounds(&in_start, in_end, &in_length);
-    if (in_length == 0) {
-        mp_raise_ValueError_varg(translate("%q length must be >= %d"), MP_QSTR_out_buffer, 1);
-    }
+    mp_arg_validate_length_min(in_length, 1, MP_QSTR_out_buffer);
 
     uint8_t status = common_hal_busio_i2c_write_read(self, args[ARG_address].u_int,
         ((uint8_t *)out_bufinfo.buf) + out_start, out_length,((uint8_t *)in_bufinfo.buf) + in_start, in_length);