ipv6: Partial checksum only UDP packets
ipv6: Partial checksum only UDP packets

ip6_append_data is used by other protocols and some of them can't
be partially checksummed.  Only partially checksum UDP protocol.

Fixes: 32dce968dd987a (ipv6: Allow for partial checksums on non-ufo packets)
Reported-by: Sabrina Dubroca <4452d71687b6bc2c9389c3349fdc17fbd73b833b@queasysnail.net>
Tested-by: Sabrina Dubroca <4452d71687b6bc2c9389c3349fdc17fbd73b833b@queasysnail.net>
Signed-off-by: Vladislav Yasevich <cbd80080413a7dff621bc5de2d3d61903bde20a2@redhat.com>
Signed-off-by: David S. Miller <fe08d3c717adf2ae63592e4c9aec6e3e404d8e3e@davemloft.net>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs