usb: misc: usbtest: remove duplicate & operation

usb_endpoint_maxp() has an inline keyword and searches for bits[10:0]
by & operation with 0x7ff. So, we can remove the duplicate & operation
with 0x7ff.
Signed-off-by: Jaejoong Kim <climbbb.kim@gmail.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>

drivers/usb/misc/usbtest.c

@@ -1908,7 +1908,7 @@ static struct urb *iso_alloc_urb(
 
 	if (bytes < 0 || !desc)
 		return NULL;
-	maxp = 0x7ff & usb_endpoint_maxp(desc);
+	maxp = usb_endpoint_maxp(desc);
 	maxp *= usb_endpoint_maxp_mult(desc);
 	packets = DIV_ROUND_UP(bytes, maxp);