iolog, dataplacement: fix Coverity Scan defect

CID 494151: Error handling issues (NEGATIVE_RETURNS) @ io_u.c:1877 in get_io_u()
This patch removes negative returns from dp_init() to ensure
its value can be properly consumed by td_verror()

Signed-off-by: Hyunwoo Park <dshw.park@samsung.com>

dataplacement.c

@@ -18,7 +18,7 @@
 static int fdp_ruh_info(struct thread_data *td, struct fio_file *f,
 			struct fio_ruhs_info *ruhs)
 {
-	int ret = -EINVAL;
+	int ret = EINVAL;
 
 	if (!td->io_ops) {
 		log_err("fio: no ops set in fdp init?!\n");
@@ -47,13 +47,13 @@ static int init_ruh_info(struct thread_data *td, struct fio_file *f)
 
 	ruhs = scalloc(1, sizeof(*ruhs) + FDP_MAX_RUHS * sizeof(*ruhs->plis));
 	if (!ruhs)
-		return -ENOMEM;
+		return ENOMEM;
 
 	/* set up the data structure used for FDP to work with the supplied stream IDs */
 	if (td->o.dp_type == FIO_DP_STREAMS) {
 		if (!td->o.dp_nr_ids) {
 			log_err("fio: stream IDs must be provided for dataplacement=streams\n");
-			return -EINVAL;
+			return EINVAL;
 		}
 		ruhs->nr_ruhs = td->o.dp_nr_ids;
 		for (int i = 0; i < ruhs->nr_ruhs; i++)
@@ -80,14 +80,14 @@ static int init_ruh_info(struct thread_data *td, struct fio_file *f)
 
 	for (i = 0; i < td->o.dp_nr_ids; i++) {
 		if (td->o.dp_ids[i] >= ruhs->nr_ruhs) {
-			ret = -EINVAL;
+			ret = EINVAL;
 			goto out;
 		}
 	}
 
 	tmp = scalloc(1, sizeof(*tmp) + ruhs->nr_ruhs * sizeof(*tmp->plis));
 	if (!tmp) {
-		ret = -ENOMEM;
+		ret = ENOMEM;
 		goto out;
 	}
 
@@ -117,13 +117,13 @@ static int init_ruh_scheme(struct thread_data *td, struct fio_file *f)
 	if (!scheme_fp) {
 		log_err("fio: ruh scheme failed to open scheme file %s\n",
 			 td->o.dp_scheme_file);
-		ret = -errno;
+		ret = errno;
 		goto out;
 	}
 
 	ruh_scheme = scalloc(1, sizeof(*ruh_scheme));
 	if (!ruh_scheme) {
-		ret = -ENOMEM;
+		ret = ENOMEM;
 		goto out_with_close_fp;
 	}