staging: rtl8188eu: Fix bug introduced by convert timers to use timer_setup()

Commit b7749656 ("staging: rtl8188eu: Convert timers to use
timer_setup()") introduces a copy and paste error which causes the
rtl8188eu driver to no longer function. This commit fixes this.

Fixes: b7749656 ("staging: rtl8188eu: Convert timers to use timer_setup()")
Cc: Kees Cook <keescook@chromium.org>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>