py/stream: Fix stupid thinko with variable naming/shadowing.

Author: pfalcon

py/stream.c

@@ -211,16 +211,16 @@ void mp_stream_write_adaptor(void *self, const char *buf, size_t len) {
 // Works only with blocking streams
 mp_uint_t mp_stream_writeall(mp_obj_t stream, const byte *buf, mp_uint_t size, int *errcode) {
  mp_obj_base_t* s = (mp_obj_base_t*)MP_OBJ_TO_PTR(stream);
- mp_uint_t sz = size;
- while (sz > 0) {
+ mp_uint_t org_size = size;
+ while (size > 0) {
  mp_uint_t out_sz = s->type->stream_p->write(stream, buf, size, errcode);
  if (out_sz == MP_STREAM_ERROR) {
  return MP_STREAM_ERROR;
  }
  buf += out_sz;
- sz -= out_sz;
+ size -= out_sz;
  }
- return size;
+ return org_size;
 }
 
 STATIC mp_obj_t stream_write_method(mp_obj_t self_in, mp_obj_t arg) {