Fix the following coccicheck warning:

drivers/usb/musb/musb_core.c:1798:12-19: WARNING: Assignment of 0/1 to
bool variable
Signed-off-by: Jason Yan <yanaijie@huawei.com>
Signed-off-by: Bin Liu <b-liu@ti.com>
Link: https://lore.kernel.org/r/20200525025049.3400-4-b-liu@ti.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>