pf: fix error codes in pf_init_unit()

Return a negative error code instead of success on these error paths.

Fixes: fb367e6baeb0 ("pf: cleanup initialization")
Signed-off-by: Dan Carpenter <[e-mail]>
Link: https://lore.kernel.org/r/20211001122654.GB2283@kili
Signed-off-by: Jens Axboe <[e-mail]>

drivers/block/paride/pf.c

···
 	return 0;
 }
 
-/*	returns  0, with id set if drive is detected
-	        -1, if drive detection failed
-*/
+/*
+ * returns 0, with id set if drive is detected, otherwise an error code.
+ */
 static int pf_probe(struct pf_unit *pf)
 {
 	if (pf->drive == -1) {
···
 			if (!pf_identify(pf))
 				return 0;
 	}
-	return -1;
+	return -ENODEV;
 }
 
 /* The i/o request engine */
···
 	snprintf(pf->name, PF_NAMELEN, "%s%d", name, disk->first_minor);
 
 	if (!pi_init(pf->pi, autoprobe, port, mode, unit, protocol, delay,
-			pf_scratch, PI_PF, verbose, pf->name))
+			pf_scratch, PI_PF, verbose, pf->name)) {
+		ret = -ENODEV;
 		goto out_free_disk;
-	if (pf_probe(pf))
+	}
+	ret = pf_probe(pf);
+	if (ret)
 		goto out_pi_release;
 
 	ret = add_disk(disk);