staging: rtl8192u: fix up indentation of a statement

There is a statement that is indented one level too deeply, remove
the extraneous tab.

Addresses-Coverity: ("Identation does not match nesting level")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Link: https://lore.kernel.org/r/20190815084034.13885-1-colin.king@canonical.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>