[ovs-dev] two variables named 'flow'

[Ben Pfaff]

GCC is telling me that ovs_flow_tbl_lookup_stats() has two variables
both named 'flow':

    datapath/linux/flow_table.c:580:40: warning: symbol 'flow' shadows an earlier one
    datapath/linux/flow_table.c:558:24: originally declared here

If it's not a bug, it still seems worth fixing.

Thanks,

Ben.