datapath: Use local variable for freeing on flow put error.

datapath: Use local variable for freeing on flow put error.

If inserting a flow failed and we need to free the actions, we
currently directly free them from the flow struct.  This is fine
but it makes sparse complain about directly accessing an RCU
protected field.  We could insert some casts to avoid this but
it's cleaner to just free the data from the local variable
instead.

Found with sparse.

Signed-off-by: Jesse Gross <jesse@nicira.com>
Acked-by: Ben Pfaff <blp@nicira.com>