HTTPTransportMac: CFStream Read() must always set at_eof

util/net/http_transport_mac.mm

Index: util/net/http_transport_mac.mm
diff --git a/util/net/http_transport_mac.mm b/util/net/http_transport_mac.mm
index 9688d18cbabb2bf83ee32359ae4b8f6d1eacdb4c..c0ff7d1834e8230a0b3da9f828da0fe449f5fca7 100644
--- a/util/net/http_transport_mac.mm
+++ b/util/net/http_transport_mac.mm
@@ -87,15 +87,17 @@ class HTTPBodyStreamCFReadStream {
                       CFStreamError* error,
                       Boolean* at_eof,
                       void* info) {
-    if (buffer_length == 0)
+    if (buffer_length == 0) {
+      *at_eof = FALSE;
       return 0;
+    }
 
     ssize_t bytes_read = GetStream(info)->GetBytesBuffer(buffer, buffer_length);
-    if (bytes_read == 0) {
-      *at_eof = TRUE;
-    } else if (bytes_read < 0) {
+    if (bytes_read < 0) {
       error->error = -1;
       error->domain = kCFStreamErrorDomainCustom;
+    } else {
+      *at_eof = bytes_read == 0;
     }
 
     return bytes_read;