[SCSI] hpsa: fix typo in comments

struct ctlr_info; /* defined in hpsa.h */

/* The size of this structure needs to be divisible by 8

 * od on all architectures, because the controller uses 2

 * on all architectures, because the controller uses 2

 * lower bits of the address, and the driver uses 1 lower

 * bit (3 bits total.)

 */