Staging: sm750fb: ddk750_swi2c.c: Insert spaces before parenthesis

Insert spaces before open parenthesis in ddk750_swi2c.c
to rectify the following checkpatch errors:
ERROR: space required before the open parenthesis '('

Signed-off-by: Isaac Assegai <isaac.a.travers@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>