staging: iio: tsl2x7x_core: remove space after a cast

Delete unneeded space after a cast as suggested by checkpatch.

CHECK: No space is necessary after a cast.

Signed-off-by: Eva Rachel Retuya <eraretuya@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>