Corrects the return value for the cases where read/write edc fails;
this prevents sysfs from retrying the operation until forever.

Corrects the printk width specifier for the first byte of buf.
Signed-off-by: NJoe Carnuccio <joe.carnuccio@qlogic.com>
Signed-off-by: NChad Dupuis <chad.dupuis@qlogic.com>
Signed-off-by: NJames Bottomley <JBottomley@Parallels.com>