Tests: corrected proxy_cache_error.t comment.
diff --git a/proxy_cache_error.t b/proxy_cache_error.t
index 2ac2d7e..d9c183e 100644
--- a/proxy_cache_error.t
+++ b/proxy_cache_error.t
@@ -78,8 +78,8 @@
# once proxy_read_timeout expires, nginx will call
# ngx_http_finalize_upstream_request() with u->pipe->downstream_error set
-# and rc = NGX_HTTP_GATEWAY_BAD_GATEWAY; after revision ad3f342f14ba046c this
-# will result in ngx_http_finalize_request(NGX_HTTP_GATEWAY_BAD_GATEWAY),
+# and rc = NGX_HTTP_BAD_GATEWAY; after revision ad3f342f14ba046c this
+# will result in ngx_http_finalize_request(NGX_HTTP_BAD_GATEWAY),
# leading to an attempt to return additional error response and
# the "header already sent" alert; fixed in 93abb5a855d6