staging: rtl8187se: remove an unnecessary line continuation

This patch fixed the following checkpatch warning:
WARNING: Avoid unnecessary line continuations

Signed-off-by: Teodora Baluta <teobaluta@gmail.com>
Reviewed-by: Josh Triplett <josh@joshtriplett.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>