check: Set error log level before checking

Not to spoil screen with false warnings.
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

cr-check.c

@@ -409,6 +409,8 @@ int cr_check(void)
 {
 	int ret = 0;
 
+	log_set_loglevel(LOG_ERROR);
+
 	if (mntns_collect_root(getpid())) {
 		pr_err("Can't collect root mount point\n");
 		return -1;