staging: r8188eu: core: remove null check before vfree

Remove NULL check. NULL check before freeing function is not needed.
Correct the indentation.

Reviewed-by: Dan Carpenter <dan.carpenter@oracle.com>
Acked-by: Michael Straube <straube.linux@gmail.com>
Signed-off-by: Saurav Girepunje <saurav.girepunje@gmail.com>
Link: https://lore.kernel.org/r/YSu9GQa1A3s6FYQx@user


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