media: b2c2-flexcop-usb: fix some whitespace coding style

On some places, there's a missing whitespace.

Link: https://lore.kernel.org/linux-media/20210526075527.302903-1-13145886936@163.com



Cc: linux-media@vger.kernel.org, linux-kernel@vger.kernel.org, gushengxian <gushengxian@yulong.com>
Signed-off-by: gushengxian <gushengxian@yulong.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>