vti4: removed duplicate log message.

commit 01ce31c57b3f07c91c9d45bbaf126124cce83a5d upstream.

Removed info log-message if ipip tunnel registration fails during
module-initialization: it adds nothing to the error message that is
written on all failures.

Fixes: dd9ee3444014e ("vti4: Fix a ipip packet processing bug in 'IPCOMP' virtual tunnel")
Signed-off-by: Jeremy Sowden <jeremy@azazel.net>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
Cc: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>