fpga: clarify that unregister functions also free

The following functions also free the struct.  Add that
fact to the function documentation.
 - fpga_mgr_free
 - fpga_bridge_free
 - fpga_region_free

Signed-off-by: Alan Tull <atull@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/drivers/fpga/fpga-mgr.c b/drivers/fpga/fpga-mgr.c
index 5fffeef..c1564cf 100644
--- a/drivers/fpga/fpga-mgr.c
+++ b/drivers/fpga/fpga-mgr.c
@@ -633,7 +633,7 @@ int fpga_mgr_register(struct fpga_manager *mgr)
 EXPORT_SYMBOL_GPL(fpga_mgr_register);
 
 /**
- * fpga_mgr_unregister - unregister a FPGA manager
+ * fpga_mgr_unregister - unregister and free a FPGA manager
  * @mgr:	fpga manager struct
  */
 void fpga_mgr_unregister(struct fpga_manager *mgr)