hpsa: logical vs bitwise AND typo

HPSA_DIAG_OPTS_DISABLE_RLD_CACHING is a mask and bitwise AND was
intended here instead of logical &&.  This bug is essentially harmless,
it means that sometimes we don't print a warning message which we wanted
to print.

Fixes: c2adae44 ('hpsa: disable report lun data caching')
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de>
Acked-by: Don Brace <don.brace@pmcs.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>