dediprog: wait for spi bulk read xfers to finish

dediprog_bulk_read_poll()'s finish argument allows it to be used in two
distinct cases: where dediprog_bulk_read_poll will be called as part of
a loop (finish=0) and where dediprog_bulk_read_poll should wait for all
outstanding transfers to finish (finish=1).  In both cases,
dediprog_bulk_read_poll() calls libusb to process events with a 10
second timeout.

After dediprog_spi_bulk_read() has queued the last transfers, it calls
dediprog_bulk_read_poll() with finish=0 when it should be finish=1.
finish=0 just happens to work because frequently the transfers finish in
the 10 second timeout.

Signed-off-by: Rick Altherr <rick@oxidecomputer.com>
Change-Id: If7cb541742c8620358c8e04275d8316131b2d1ab
Original-Reviewed-on: https://review.coreboot.org/c/flashrom/+/60087
Original-Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Original-Reviewed-by: Nico Huber <nico.h@gmx.de>
Reviewed-on: https://review.coreboot.org/c/flashrom-stable/+/71441
Reviewed-by: Rick Altherr <kc8apf@kc8apf.net>
Reviewed-by: Nico Huber <nico.h@gmx.de>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
diff --git a/dediprog.c b/dediprog.c
index 7699d6d..2d266d4 100644
--- a/dediprog.c
+++ b/dediprog.c
@@ -528,7 +528,7 @@
 			goto err_free;
 	}
 	/* Wait for transfers to finish. */
-	if (dediprog_bulk_read_poll(dp_data->usb_ctx, &status, 0))
+	if (dediprog_bulk_read_poll(dp_data->usb_ctx, &status, 1))
 		goto err_free;
 	/* Check if everything has been transmitted. */
 	if ((status.finished_idx < count) || status.error)