Remove trailing whitespaces from empty line

Signed-off-by: sirwio <[email protected]>

Author: sirwio

plugins/out_es/es.c

@@ -520,7 +520,7 @@ static int cb_es_init(struct flb_output_instance *ins,
 
     mk_list_init(&ctx->configs);
     flb_output_set_context(ins, ctx);
-    
+
     /* Configure HA or simple mode ? */
     tmp = flb_output_get_property("upstream", ins);
     if (tmp) {