Clear errno before check.
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@ -358,6 +358,7 @@ static int dynsec__config_load(void)
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cJSON *tree;
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/* Load from file */
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errno = 0;
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fptr = fopen(config_file, "rb");
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if(fptr == NULL){
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mosquitto_log_printf(MOSQ_LOG_ERR, "Error loading Dynamic security plugin config: File is not readable - check permissions.\n");
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