stdio: Tidy up the coding style

Bring the coding style in this file up to the current level.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/include/stdio_dev.h b/include/stdio_dev.h
index b61c0c6..48871a6 100644
--- a/include/stdio_dev.h
+++ b/include/stdio_dev.h
@@ -84,6 +84,15 @@
 
 void stdio_print_current_devices(void);
 int stdio_deregister(const char *devname, int force);
+
+/**
+ * stdio_deregister_dev() - deregister the device "devname".
+ *
+ * @dev: Stdio device to deregister
+ * @force: true to force deregistration even if in use
+ *
+ * returns 0 on success, -EBUSY if device is assigned
+ */
 int stdio_deregister_dev(struct stdio_dev *dev, int force);
 struct list_head *stdio_get_list(void);
 struct stdio_dev *stdio_get_by_name(const char *name);