staging: rtl8188eu: core: Removed unnecessary return keyword.

This patch fixes
WARNING:  void function return statements are not generally useful
checkpatch.pl warning in rtw_efuse.c by using this coccinelle script

@r@
identifier i;
@@
void i(...)
{
...
-return;
}

Signed-off-by: Gulsah Kose <gulsah.1004@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>