staging: rts5208: split long line of code

Fix checkpatch warning by splitting up a long line of code, improving
code readability

Signed-off-by: Tanjuate Brunostar <tanjubrunostar0@gmail.com>
Acked-by: Julia Lawall <julia.lawall@inria.fr>
Link: https://lore.kernel.org/r/Y06Vsr7JVvpPem5T@elroy-temp-vm.gaiao0uenmiufjlowqgp5yxwdh.gvxx.internal.cloudapp.net


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