pm: device: check for ENOSYS

If feature is not available -ENOSYS is used instead of -ENOTSUP.

Signed-off-by: Gerard Marull-Paretas <gerard.marull@nordicsemi.no>
diff --git a/subsys/pm/device.c b/subsys/pm/device.c
index 324d5bc..34e66dbf 100644
--- a/subsys/pm/device.c
+++ b/subsys/pm/device.c
@@ -70,7 +70,7 @@
 	}
 
 	rc = pm_device_state_get(dev, &current_state);
-	if ((rc != -ENOTSUP) && (rc != 0)) {
+	if ((rc != -ENOSYS) && (rc != 0)) {
 		LOG_DBG("Was not possible to get device %s state: %d",
 			dev->name, rc);
 		return true;
@@ -105,7 +105,7 @@
 			 * in the right state.
 			 */
 			rc = pm_device_state_set(dev, state, NULL, NULL);
-			if ((rc != -ENOTSUP) && (rc != 0)) {
+			if ((rc != -ENOSYS) && (rc != 0)) {
 				LOG_DBG("%s did not enter %s state: %d",
 					dev->name, pm_device_state_str(state),
 					rc);