Staging: serqt_usb2: fixed frivolous else statement warnings

This is a patch to the serqt_usb2.c file that fixes three instances
of the following checkpatch.pl warning:
WARNING: else is not generally useful after a break or return

Signed-off-by: Vincent Heuken <me@vincentheuken.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>