staging: wfx: Remove unnecessary return variable

Remove redundant variable in file fwio.c used for returning value.

Issue was found using Coccinelle:

@@
local idexpression ret;
expression e;
@@

-ret =
+return
     e;
-return ret;

Signed-off-by: Sumera Priyadarsini <sylphrenadin@gmail.com>
Link: https://lore.kernel.org/r/20200726130720.12993-1-sylphrenadin@gmail.com


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