hpsa: fix an sprintf() overflow in the reset handler

The string "cmd %d RESET FAILED, new lockup detected" is not quite
large enough so the sprintf() will overflow.  I have increased the size
of the buffer and also changed the sprintf calls to snprintf.

Fixes: 73153fe5 ('hpsa: use block layer tag for command allocation')
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Acked-by: Don Brace <don.brace@pmcs.com>
Signed-off-by: James Bottomley <JBottomley@Odin.com>