wlan-ng/prism2sta:checkpatch: Fix string split

This patch fixes a warning of checkpatch about string splitting.

Signed-off-by: Johannes Stadlinger <Johannes.Stadlinger@fau.de>
Signed-off-by: Maximilian Eschenbacher <maximilian@eschenbacher.email>
CC: linux-kernel@i4.cs.fau.de
CC: Tugce Sirin <ztugcesirin@gmail.com>
Reviewed-by: Josh Triplett <josh@joshtriplett.org>
CC: Vitaly Osipov <vitaly.osipov@gmail.com>
CC: Neil Armstrong <superna9999@gmail.com>
CC: Paul Gortmaker <paul.gortmaker@windriver.com>
CC: devel@driverdev.osuosl.org
CC: linux-kernel@vger.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>