fabrics: update get_entity_name() return handling

Copilot identified an issue with the return handling of get_entity_name()
which could potentially display a misleading error message by nvme_strerror().
Fix the same.

Signed-off-by: Martin George <[email protected]>

Author: martin-gpy

libnvme/src/nvme/fabrics.c

@@ -1793,9 +1793,12 @@ static int nvmf_dim(nvme_ctrl_t c, enum nvmf_dim_tas tas, __u8 trtype,
 	       MIN(sizeof(dim->eid), strlen(c->s->h->hostnqn)));
 
 	ret = get_entity_name(dim->ename, sizeof(dim->ename));
-	if (ret <= 0)
+	if (ret < 0)
 		nvme_msg(ctx, LOG_INFO, "%s: Failed to retrieve ENAME. %s.\n",
-			 c->name, nvme_strerror(ret));
+			 c->name, nvme_strerror(-ret));
+	else if (ret == 0)
+		nvme_msg(ctx, LOG_INFO, "%s: Failed to retrieve ENAME.\n",
+			 c->name);
 
 	ret = get_entity_version(dim->ever, sizeof(dim->ever));
 	if (ret <= 0)