doc: replace @return by Return:

Sphinx expects Return: and not @return to indicate a return value.

find . -name '*.c' -exec \
sed -i 's/^\(\s\)\*\(\s*\)@return\(\s\)/\1*\2Return:\3/' {} \;

find . -name '*.h' -exec \
sed -i 's/^\(\s\)\*\(\s*\)@return\(\s\)/\1*\2Return:\3/' {} \;

Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
diff --git a/drivers/usb/musb-new/musb_gadget.c b/drivers/usb/musb-new/musb_gadget.c
index 7cca92b..05bd948 100644
--- a/drivers/usb/musb-new/musb_gadget.c
+++ b/drivers/usb/musb-new/musb_gadget.c
@@ -1966,7 +1966,7 @@
  * -ENOMEM no memory to perform the operation
  *
  * @param driver the gadget driver
- * @return <0 if error, 0 if everything is fine
+ * Return: <0 if error, 0 if everything is fine
  */
 #ifndef __UBOOT__
 static int musb_gadget_start(struct usb_gadget *g,