Staging: rtl8188eu: hal: Compress return logic into one line

Simplify function returns by merging assignment and return into
one command line.
Found with Coccinelle
@@
expression e, ret;
@@

-ret =
+return
        e;
-return ret;

Signed-off-by: Mihaela Muraru <mihaela.muraru21@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>