A previous change blamed it on compiler/ASan, while this is a real
(yet minor) issue.
This return -EINVAL is never reached since we test all combinations of
fidx and fcin booleans.
All branches end up with a return 0, factorize them.
Fixes: 84f5ac9418 ("pipeline: fix build with ASan")
Fixes: f38913b7fb ("pipeline: add meter array to SWX")
Signed-off-by: David Marchand <david.marchand@redhat.com>
Acked-by: Cristian Dumitrescu <cristian.dumitrescu@intel.com>
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