usb: ldusb: replace ternary operator with max_t()

usb: ldusb: replace ternary operator with max_t()

Fix the following coccicheck warning:

drivers/usb/misc/ldusb.c:719: WARNING opportunity for max().
drivers/usb/misc/ldusb.c:721: WARNING opportunity for max().

max_t() macro is defined in include/linux/minmax.h. It avoids
multiple evaluations of the arguments when non-constant and performs
strict type-checking.

Signed-off-by: Jiangshan Yi <yijiangshan@kylinos.cn>
Link: https://lore.kernel.org/r/20220713070205.3047256-1-13667453960@163.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>