block: sed-opal: print failed function address

Add function address (and if available its symbol) to the message if a
step function fails.
Signed-off-by: NJonas Rabenstein <jonas.rabenstein@studium.uni-erlangen.de>
Signed-off-by: NDavid Kozub <zub@linux.fjfi.cvut.cz>
Reviewed-by: NScott Bauer <sbauer@plzdonthack.me>
Reviewed-by: NChristoph Hellwig <hch@lst.de>
Reviewed-by: Jon Derrick <jonathan.derrick@intel.com
Signed-off-by: NJens Axboe <axboe@kernel.dk>

block/sed-opal.c

@@ -394,8 +394,8 @@ static int next(struct opal_dev *dev)
 
 		error = step->fn(dev, step->data);
 		if (error) {
-			pr_debug("Error on step function: %d with error %d: %s\n",
-				 state, error,
+			pr_debug("Step %d (%pS) failed with error %d: %s\n",
+				 state, step->fn, error,
 				 opal_error_to_human(error));
 
 			/* For each OPAL command we do a discovery0 then we