esp.c: remove TC adjustment in esp_do_dma() from device path

Now that the TC is updated for each PDMA access (rather than once the FIFO is
full) there is no need to adjust the TC at start of each DMA transfer if the
FIFO is not empty.

Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Tested-by: Helge Deller <deller@gmx.de>
Tested-by: Thomas Huth <thuth@redhat.com>
Message-Id: <20240112125420.514425-25-mark.cave-ayland@ilande.co.uk>
Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>

hw/scsi/esp.c

@@ -754,11 +754,6 @@ static void esp_do_dma(ESPState *s)
                 esp_lower_drq(s);
             }
         } else {
-            /* Adjust TC for any leftover data in the FIFO */
-            if (!fifo8_is_empty(&s->fifo)) {
-                esp_set_tc(s, esp_get_tc(s) - fifo8_num_used(&s->fifo));
-            }
-
             /* Copy device data to FIFO */
             len = MIN(len, fifo8_num_free(&s->fifo));
             fifo8_push_all(&s->fifo, s->async_buf, len);