net: phy: sfp-bus.c: get rid of docs warnings

The indentation for the returned values are weird, causing those
warnings:

	./drivers/net/phy/sfp-bus.c:579: WARNING: Unexpected indentation.
	./drivers/net/phy/sfp-bus.c:619: WARNING: Unexpected indentation.

Use a list and change the identation for it to be properly
parsed by the documentation toolchain.
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/phy/sfp-bus.c

@@ -572,13 +572,15 @@ static void sfp_upstream_clear(struct sfp_bus *bus)
  * the sfp_bus structure, incrementing its reference count.  This must
  * be put via sfp_bus_put() when done.
  *
- * Returns: on success, a pointer to the sfp_bus structure,
- *	    %NULL if no SFP is specified,
- * 	    on failure, an error pointer value:
- * 		corresponding to the errors detailed for
- * 		fwnode_property_get_reference_args().
- * 	        %-ENOMEM if we failed to allocate the bus.
- *		an error from the upstream's connect_phy() method.
+ * Returns:
+ * 	    - on success, a pointer to the sfp_bus structure,
+ *	    - %NULL if no SFP is specified,
+ * 	    - on failure, an error pointer value:
+ *
+ * 	      - corresponding to the errors detailed for
+ * 	        fwnode_property_get_reference_args().
+ * 	      - %-ENOMEM if we failed to allocate the bus.
+ *	      - an error from the upstream's connect_phy() method.
  */
 struct sfp_bus *sfp_bus_find_fwnode(struct fwnode_handle *fwnode)
 {
@@ -612,13 +614,15 @@ EXPORT_SYMBOL_GPL(sfp_bus_find_fwnode);
  * the SFP bus using sfp_register_upstream().  This takes a reference on the
  * bus, so it is safe to put the bus after this call.
  *
- * Returns: on success, a pointer to the sfp_bus structure,
- *	    %NULL if no SFP is specified,
- * 	    on failure, an error pointer value:
- * 		corresponding to the errors detailed for
- * 		fwnode_property_get_reference_args().
- * 	        %-ENOMEM if we failed to allocate the bus.
- *		an error from the upstream's connect_phy() method.
+ * Returns:
+ * 	    - on success, a pointer to the sfp_bus structure,
+ *	    - %NULL if no SFP is specified,
+ * 	    - on failure, an error pointer value:
+ *
+ * 	      - corresponding to the errors detailed for
+ * 	        fwnode_property_get_reference_args().
+ * 	      - %-ENOMEM if we failed to allocate the bus.
+ *	      - an error from the upstream's connect_phy() method.
  */
 int sfp_bus_add_upstream(struct sfp_bus *bus, void *upstream,
 			 const struct sfp_upstream_ops *ops)