staging: rtl8723bs: rtw_cmd: Compress lines for immediate return

Compress two lines into a single line if immediate return statement is found.
It also removes variable cmd_obj as it is no longer needed.

It is done using script Coccinelle.
And coccinelle uses following semantic patch for this compression function:

@@
expression ret;
identifier f;
@@

-ret =
+return
     f(...);
-return ret;
Signed-off-by: Simran Singhal <singhalsimran0@gmail.com>
Link: https://lore.kernel.org/r/20200325212253.GA8175@simran-Inspiron-5558Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/rtl8723bs/core/rtw_cmd.c

@@ -362,11 +362,7 @@ int rtw_enqueue_cmd(struct cmd_priv *pcmdpriv, struct cmd_obj *cmd_obj)
 
 struct	cmd_obj	*rtw_dequeue_cmd(struct cmd_priv *pcmdpriv)
 {
-	struct cmd_obj *cmd_obj;
-
-	cmd_obj = _rtw_dequeue_cmd(&pcmdpriv->cmd_queue);
-
-	return cmd_obj;
+	return _rtw_dequeue_cmd(&pcmdpriv->cmd_queue);
 }
 
 void rtw_free_cmd_obj(struct cmd_obj *pcmd)