staging: lustre: ldlm: free resource when ldlm_lock_create() fails.

ldlm_lock_create() gets a resource, but don't put it on
all failure paths. It should.

Signed-off-by: NeilBrown <neilb@suse.com>
Reviewed-by: James Simmons <jsimmons@infradead.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>