staging: lustre: Make struct mdc_kuc_fops static

This patch fixes the following Sparse warning:
"symbol 'mdc_kuc_fops' was not declared. Should it be static?".
Signed-off-by: Dzmitry Sledneu <dzmitry.sledneu@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/lustre/lustre/mdc/lproc_mdc.c

@@ -147,7 +147,7 @@ static ssize_t mdc_kuc_write(struct file *file,
 	return count;
 }
 
-struct file_operations mdc_kuc_fops = {
+static struct file_operations mdc_kuc_fops = {
 	.open		= mdc_kuc_open,
 	.write		= mdc_kuc_write,
 	.release	= single_release,