staging:lustre:lnet: lib-md.c delete space before '(' for code style

Silences the following checkpatch warning:
  WARNING: space prohibited between function name and open parenthesis '('

Signed-off-by: Janet Liu <jianhua.ljh@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>