staging: pi433: Split some function calls

Split some function calls on several lines in order to make these
lines no longer than 80 columns. Problem found with checkpatch.

Signed-off-by: Eisha Chen-yen-su <chenyensu0@gmail.com>
Acked-by: Julia Lawall <julia.lawall@lip6.fr>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>