Fix the following coccicheck warning:
drivers/net/vxlan/vxlan_core.c:2995:5-8:
Unneeded variable: "ret". Return "0" on line 3004.
Fixes: f9c4bb0b245c ("vxlan: vni filtering support on collect metadata device")
Signed-off-by: Guo Zhengkui <guozhengkui@xxxxxxxx>
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