mlxsw: fix mlxsw_sp2_nve_vxlan_learning_set() return type
The mlxsw_sp2_nve_vxlan_learning_set() function is supposed to return
zero on success or negative error codes. So it needs to be type int
instead of bool.
Fixes: 4ee70efab68d ("mlxsw: spectrum_nve: Add support for VXLAN on Spectrum-2") Signed-off-by: Dan Carpenter <dan.carpenter@linaro.org> Reviewed-by: Petr Machata <petrm@nvidia.com> Signed-off-by: David S. Miller <davem@davemloft.net>