staging/lustre/osc: indent an if statement

We accidentally removed a tab here.  Let's add it back, and some curly
braces as well since this is a muti-line indent.

Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Reviewed-by: James Simmons <jsimmons@infradead.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>