Simplify libusb_fill_control_transfer()

Transfer length can be inferred from the setup packet.

1 files changed, 3 insertions, 4 deletions

diff --git a/examples/dpfp.c b/examples/dpfp.c
index a5151f2..c56e8d8 100644
--- a/examples/dpfp.c
+++ b/examples/dpfp.c
@@ -168,8 +168,7 @@ static void cb_mode_changed(struct libusb_transfer *transfer)
 
 static int set_mode_async(unsigned char data)
 {
-	int bufsize = LIBUSB_CONTROL_SETUP_SIZE + 1;
-	unsigned char *buf = malloc(bufsize);
+	unsigned char *buf = malloc(LIBUSB_CONTROL_SETUP_SIZE + 1);
 	struct libusb_transfer *transfer;
 
 	if (!buf)
@@ -184,8 +183,8 @@ static int set_mode_async(unsigned char data)
 	printf("async set mode %02x\n", data);
 	libusb_fill_control_setup(buf, CTRL_OUT, USB_RQ, 0x4e, 0, 1);
 	buf[LIBUSB_CONTROL_SETUP_SIZE] = data;
-	libusb_fill_control_transfer(transfer, devh, buf, bufsize,
-		cb_mode_changed, NULL, 1000);
+	libusb_fill_control_transfer(transfer, devh, buf, cb_mode_changed, NULL,
+		1000);
 
 	return libusb_submit_transfer(transfer);
 }