ipvs: fix crash with sync protocol v0 and FTP
ipvs: fix crash with sync protocol v0 and FTP

Fix crash in 3.5+ if FTP is used after switching
sync_version to 0.

Fixes: 749c42b620a9 ("ipvs: reduce sync rate with time thresholds")
Signed-off-by: Julian Anastasov <84572ef2253ef81e2d8cd8c65849f4d9a3881f47@ssi.bg>
Signed-off-by: Simon Horman <a105fd58f578dea0be108941d4c59d15396e1855@verge.net.au>

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