staging: wilc1000: Fix line over 80 characters

Break the line after '+' to remove the checkpatch.pl warning. Remove
trailing whitespace after '+' if any:
WARNING: line over 80 characters

Signed-off-by: Debleena Sen <idebleenasen@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>