staging: wfx: dat_tx.c: remove space after a cast

remove extra spaces after casts in file data_tx.c

Signed-off-by: Kaaira Gupta <kgupta@es.iitr.ac.in>
Link: https://lore.kernel.org/r/20200310142509.25632-4-kgupta@es.iitr.ac.in


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