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db_redis: fixed compile warning on testing array address

Daniel-Constantin Mierla authored on 24/09/2018 18:05:26
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@@ -405,9 +405,9 @@ void db_redis_consume_replies(km_redis_con_t *con) {
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 }
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 const char *db_redis_get_error(km_redis_con_t *con) {
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-    if (con && con->con && con->con->errstr) {
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+    if (con && con->con && con->con->errstr[0]) {
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         return con->con->errstr;
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     } else {
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         return "<broken redis connection>";
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     }
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-}
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\ No newline at end of file
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+}