Fix test in lbs_spi_thread(). down_interruptible() can return -EINTR, but
not EINTR.
Signed-off-by: Roel Kluin <roel.kluin@gmail.com> Cc: Dan Williams <dcbw@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: John W. Linville <linville@tuxdriver.com>