qht: return existing entry when qht_insert fails
The meaning of "existing" is now changed to "matches in hash and ht->cmp result". This is saner than just checking the pointer value. Suggested-by: NRichard Henderson <richard.henderson@linaro.org> Reviewed-by: NRichard Henderson <richard.henderson@linaro.org> Reviewed-by: NAlex Bennée <alex.bennee@linaro.org> Signed-off-by: NEmilio G. Cota <cota@braap.org> Signed-off-by: NRichard Henderson <richard.henderson@linaro.org>
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