eal: fix option --base-virtaddr

When parsing EAL option --base-virtaddr
errno was not being set to 0 before calling strtoull,
therefore function might fail unnecesarily.

Signed-off-by: Pablo de Lara <pablo.de.lara.guarch@intel.com>
Signed-off-by: Aaron Campbell <aaron@arbor.net>
Acked-by: Anatoly Burakov <anatoly.burakov@intel.com>

lib/librte_eal/linuxapp/eal/eal.c

@@ -562,6 +562,7 @@ eal_parse_base_virtaddr(const char *arg)
 	char *end;
 	uint64_t addr;
 
+	errno = 0;
 	addr = strtoull(arg, &end, 16);
 
 	/* check for errors */