delete useless code
diff --git a/src/http/modules/ngx_http_proxy_module.c b/src/http/modules/ngx_http_proxy_module.c
index a6f8755..fd31253 100644
--- a/src/http/modules/ngx_http_proxy_module.c
+++ b/src/http/modules/ngx_http_proxy_module.c
@@ -1772,9 +1772,7 @@
         return NGX_ERROR;
     }
 
-    p = data;
-
-    p = ngx_copy(p, h->value.data, prefix);
+    p = ngx_copy(data, h->value.data, prefix);
 
     if (pr->replacement.text.len) {
         p = ngx_copy(p, pr->replacement.text.data, pr->replacement.text.len);
@@ -1824,9 +1822,7 @@
         return NGX_ERROR;
     }
 
-    p = data;
-
-    p = ngx_copy(p, h->value.data, prefix);
+    p = ngx_copy(data, h->value.data, prefix);
 
     e.ip = pr->replacement.vars.values;
     e.pos = p;