usb: host: ehci-sched: remove prohibited spaces

This patch removes prohibited spaces before open parenthesis and open
brackets.

It also removes an assignment inside condition and unnecessary braces in
single statement block.

Tested by compilation only.
Caught by checkpatch.
Signed-off-by: Geyslan G. Bem <geyslan@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>