Fix compiler warnings.

* protocols/http2_protocol.c
  (http2_handle_stream_window_update, http2_handle_connection_window_update):
      A 32-bit unsigned integer shouldn't be compared < 0). The existing test
      ' > 0x7FFFFFFF is sufficient. In fact, since current code is reading
      4 bytes and then sets the top bit to 0, the situation tested for can never
      happen.


git-svn-id: https://svn.apache.org/repos/asf/serf/trunk@1748025 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/protocols/http2_protocol.c b/protocols/http2_protocol.c
index bf06a78..fd21c4e 100644
--- a/protocols/http2_protocol.c
+++ b/protocols/http2_protocol.c
@@ -1,4 +1,4 @@
-/* ====================================================================
+	/* ====================================================================
  *    Licensed to the Apache Software Foundation (ASF) under one
  *    or more contributor license agreements.  See the NOTICE file
  *    distributed with this work for additional information
@@ -634,7 +634,7 @@
 
     stream->lr_window += value;
 
-    if (stream->lr_window > HTTP2_WINDOW_MAX_ALLOWED || stream->lr_window < 0)
+    if (stream->lr_window > HTTP2_WINDOW_MAX_ALLOWED	)
     {
       /* A sender MUST NOT allow a flow-control window to exceed 2^31-1
          octets.  If a sender receives a WINDOW_UPDATE that causes a flow-
@@ -693,7 +693,7 @@
     was0 = (h2->lr_window == 0);
     h2->lr_window += value;
 
-    if (h2->lr_window > HTTP2_WINDOW_MAX_ALLOWED || h2->lr_window < 0)
+    if (h2->lr_window > HTTP2_WINDOW_MAX_ALLOWED)
     {
       /* A sender MUST NOT allow a flow-control window to exceed 2^31-1
          octets.  If a sender receives a WINDOW_UPDATE that causes a flow-