media: flexcop-usb: clean up endpoint sanity checks

media: flexcop-usb: clean up endpoint sanity checks

[ Upstream commit 3de50478b5cc2e0c2479a5f2b967f331f7597d23 ]

Add a temporary variable to make the endpoint sanity checks a bit more
readable.

While at it, fix a typo in the usb_set_interface() comment.

Signed-off-by: Johan Hovold <johan@kernel.org>
Link: https://lore.kernel.org/r/20220822151456.27178-2-johan@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Stable-dep-of: f62dc8f6bf82 ("media: flexcop-usb: fix sanity check of bNumEndpoints")
Signed-off-by: Sasha Levin <sashal@kernel.org>