staging: wimax: i2400m: add space before open parenthesis

fixing ERROR: space required before the open parenthesis '('

Signed-off-by: Rajesh Kumbhakar <sssraj.sssraj@gmail.com>
Link: https://lore.kernel.org/r/20210221133951.21234-1-sssraj.sssraj@gmail.com


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