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-5558


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>