usb: isp1760: isp1760-hcd.c: Drop condition with no effect

As the "else if" and "else" branch body are identical the condition
has no effect. So drop the else if condition.

Signed-off-by: Saurav Girepunje <saurav.girepunje@gmail.com>
Link: https://lore.kernel.org/r/20191005053733.GA10727@saurav


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>