fpga: bridge: fix kernel-doc

Fix the following warnings issued by the kernel-doc script:

drivers/fpga/fpga-bridge.c:99: warning: No description found for return value of 'of_fpga_bridge_get'
drivers/fpga/fpga-bridge.c:163: warning: No description found for return value of 'fpga_bridges_enable'
drivers/fpga/fpga-bridge.c:187: warning: No description found for return value of 'fpga_bridges_disable'
drivers/fpga/fpga-bridge.c:238: warning: No description found for return value of 'of_fpga_bridge_get_to_list'
drivers/fpga/fpga-bridge.c:268: warning: No description found for return value of 'fpga_bridge_get_to_list'

- Extend the return description of of_fpga_bridge_get() to include the
  case when try_module_get() fails.
Signed-off-by: Marco Pagani <marpagan@redhat.com>
Reviewed-by: Randy Dunlap <rdunlap@infradead.org>
Acked-by: Xu Yilun <yilun.xu@intel.com>
Link: https://lore.kernel.org/r/20230706142755.124879-3-marpagan@redhat.comSigned-off-by: Xu Yilun <yilun.xu@intel.com>

drivers/fpga/fpga-bridge.c

@@ -87,12 +87,13 @@ static struct fpga_bridge *__fpga_bridge_get(struct device *dev,
 /**
  * of_fpga_bridge_get - get an exclusive reference to an fpga bridge
  *
- * @np: node pointer of an FPGA bridge
- * @info: fpga image specific information
+ * @np: node pointer of an FPGA bridge.
+ * @info: fpga image specific information.
  *
- * Return fpga_bridge struct if successful.
- * Return -EBUSY if someone already has a reference to the bridge.
- * Return -ENODEV if @np is not an FPGA Bridge.
+ * Return:
+ * * fpga_bridge struct pointer if successful.
+ * * -EBUSY if someone already has a reference to the bridge.
+ * * -ENODEV if @np is not an FPGA Bridge or can't take parent driver refcount.
  */
 struct fpga_bridge *of_fpga_bridge_get(struct device_node *np,
 				       struct fpga_image_info *info)
@@ -155,9 +156,9 @@ EXPORT_SYMBOL_GPL(fpga_bridge_put);
  * fpga_bridges_enable - enable bridges in a list
  * @bridge_list: list of FPGA bridges
  *
- * Enable each bridge in the list.  If list is empty, do nothing.
+ * Enable each bridge in the list. If list is empty, do nothing.
  *
- * Return 0 for success or empty bridge list; return error code otherwise.
+ * Return: 0 for success or empty bridge list or an error code otherwise.
  */
 int fpga_bridges_enable(struct list_head *bridge_list)
 {
@@ -179,9 +180,9 @@ EXPORT_SYMBOL_GPL(fpga_bridges_enable);
  *
  * @bridge_list: list of FPGA bridges
  *
- * Disable each bridge in the list.  If list is empty, do nothing.
+ * Disable each bridge in the list. If list is empty, do nothing.
  *
- * Return 0 for success or empty bridge list; return error code otherwise.
+ * Return: 0 for success or empty bridge list or an error code otherwise.
  */
 int fpga_bridges_disable(struct list_head *bridge_list)
 {
@@ -230,7 +231,7 @@ EXPORT_SYMBOL_GPL(fpga_bridges_put);
  *
  * Get an exclusive reference to the bridge and it to the list.
  *
- * Return 0 for success, error code from of_fpga_bridge_get() otherwise.
+ * Return: 0 for success, error code from of_fpga_bridge_get() otherwise.
  */
 int of_fpga_bridge_get_to_list(struct device_node *np,
 			       struct fpga_image_info *info,
@@ -260,7 +261,7 @@ EXPORT_SYMBOL_GPL(of_fpga_bridge_get_to_list);
  *
  * Get an exclusive reference to the bridge and it to the list.
  *
- * Return 0 for success, error code from fpga_bridge_get() otherwise.
+ * Return: 0 for success, error code from fpga_bridge_get() otherwise.
  */
 int fpga_bridge_get_to_list(struct device *dev,
 			    struct fpga_image_info *info,