style fix: remove trailing spaces

src/http/ngx_http_upstream_round_robin.h

diff --git a/src/http/ngx_http_upstream_round_robin.h b/src/http/ngx_http_upstream_round_robin.h
index 0f7d84b..5d95221 100644
--- a/src/http/ngx_http_upstream_round_robin.h
+++ b/src/http/ngx_http_upstream_round_robin.h
@@ -53,7 +53,7 @@
 typedef struct {
     ngx_http_upstream_rr_peers_t   *peers;
     ngx_uint_t                      current;
-    uintptr_t                      *tried; 
+    uintptr_t                      *tried;
     uintptr_t                       data;
 } ngx_http_upstream_rr_peer_data_t;