drivers/scsi/st.c:2283: warning: suggest parentheses around && within ||

Cc: James E.J. Bottomley <James.Bottomley@HansenPartnership.com>
Cc: Roel Kluin <roel.kluin@gmail.com>
Cc: Willem Riede <osst@riede.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>