[PATCH v1 4/4] hw/i3c/mock-i3c-target: Simplify GETMRL byte extraction logic

[Jamin Lin <jamin_lin@aspeedtech.com>]

The GETMRL handling logic extracted MSB/LSB bytes from
s->cfg.buf_size using a mask-and-shift expression:

  (buf_size & (0xff00 >> (offset * 8))) >>
  (8 - (offset * 8))

While functionally correct, the expression is difficult to read
and obscures the intent, which is simply to return a 16-bit value
in MSB-first order.

Replace the mask/shift formula with explicit MSB/LSB extraction:

  offset == 0 -> buf_size >> 8
  offset == 1 -> buf_size & 0xff

This makes the code clearer and easier to review without altering
behavior or data ordering.

No functional change.

Signed-off-by: Jamin Lin <jamin_lin@aspeedtech.com>
---
 hw/i3c/mock-i3c-target.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/hw/i3c/mock-i3c-target.c b/hw/i3c/mock-i3c-target.c
index 5c913ee49b..845c173427 100644
--- a/hw/i3c/mock-i3c-target.c
+++ b/hw/i3c/mock-i3c-target.c
@@ -145,9 +145,12 @@ static int mock_i3c_target_handle_ccc_read(I3CTarget *i3c, uint8_t *data,
             if (s->ccc_byte_offset >= 2) {
                 break;
             }
-            data[s->ccc_byte_offset] = (s->cfg.buf_size &
-                                        (0xff00 >> (s->ccc_byte_offset * 8))) >>
-                                        (8 - (s->ccc_byte_offset * 8));
+            if (s->ccc_byte_offset == 0) {
+                data[s->ccc_byte_offset] = (uint8_t)(s->cfg.buf_size >> 8);
+            } else {
+                data[s->ccc_byte_offset] = (uint8_t)s->cfg.buf_size;
+            }
+
             s->ccc_byte_offset++;
             *num_read = num_to_read;
         }
-- 
2.43.0