eal: fix log level of error in option register

INFO is not correct when logging an error.

Fixes: 2395332798 ("eal: add option register infrastructure")
Cc: stable@dpdk.org

Signed-off-by: Gaetan Rivet <gaetan.rivet@6wind.com>

lib/librte_eal/common/rte_option.c

@@ -56,7 +56,7 @@ rte_option_register(struct rte_option *opt)
 
 	TAILQ_FOREACH(option, &rte_option_list, next) {
 		if (strcmp(opt->name, option->name) == 0) {
-			RTE_LOG(INFO, EAL, "Option %s has already been registered.\n",
+			RTE_LOG(ERR, EAL, "Option %s has already been registered.\n",
 					opt->name);
 			return;
 		}