MINOR: proto_http.c 502 error txt typo.

[wt: should be backported to 1.7 and 1.6 as it was introduced in 1.6-dev4]
diff --git a/src/proto_http.c b/src/proto_http.c
index 8bc1636..3490aa7 100644
--- a/src/proto_http.c
+++ b/src/proto_http.c
@@ -343,7 +343,7 @@
 	case 499: return "client has closed connection";
 	case 500: return "Internal Server Error";
 	case 501: return "Not Implemented";
-	case 502: return "Bad Gateway ou Proxy Error";
+	case 502: return "Bad Gateway or Proxy Error";
 	case 503: return "Service Unavailable";
 	case 504: return "Gateway Time-out";
 	case 505: return "HTTP Version not supported";