staging: gdm72xx: 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: Alison Schofield <amsfield22@gmail.com>
Acked-by: Julia Lawall <julia.lawall@lip6.fr>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>