[ostree] trivial-httpd: Avoid SoupBuffer when there's no content

[Matthew Barnes <mbarnes src gnome org>]

commit 74d8e5f15969e2bf832d060e18c7f8c9f3f11a55
Author: Matthew Barnes <mbarnes redhat com>
Date:   Mon Nov 23 14:29:03 2015 -0500

    trivial-httpd: Avoid SoupBuffer when there's no content
    
    This was supposed to be merged into the previous commit, but I
    messed up.

 src/ostree/ot-builtin-trivial-httpd.c |   20 ++++++++++++--------
 1 files changed, 12 insertions(+), 8 deletions(-)
---
diff --git a/src/ostree/ot-builtin-trivial-httpd.c b/src/ostree/ot-builtin-trivial-httpd.c
index c6a3757..b5fb5d0 100644
--- a/src/ostree/ot-builtin-trivial-httpd.c
+++ b/src/ostree/ot-builtin-trivial-httpd.c
@@ -225,8 +225,7 @@ do_get (OtTrivialHttpd    *self,
       
       if (msg->method == SOUP_METHOD_GET)
         {
-          GMappedFile *mapping;
-          SoupBuffer *buffer;
+          g_autoptr(GMappedFile) mapping = NULL;
           gsize buffer_length, file_size;
           SoupRange *ranges;
           int ranges_length;
@@ -270,12 +269,17 @@ do_get (OtTrivialHttpd    *self,
                 }
               soup_message_headers_free_ranges (msg->request_headers, ranges);
             }
-          buffer = soup_buffer_new_with_owner (g_mapped_file_get_contents (mapping),
-                                               buffer_length,
-                                               mapping, (GDestroyNotify)g_mapped_file_unref);
-          if (buffer->length > 0)
-            soup_message_body_append_buffer (msg->response_body, buffer);
-          soup_buffer_free (buffer);
+          if (buffer_length > 0)
+            {
+              SoupBuffer *buffer;
+
+              buffer = soup_buffer_new_with_owner (g_mapped_file_get_contents (mapping),
+                                                   buffer_length,
+                                                   g_mapped_file_ref (mapping),
+                                                   (GDestroyNotify)g_mapped_file_unref);
+              soup_message_body_append_buffer (msg->response_body, buffer);
+              soup_buffer_free (buffer);
+            }
         }
       else /* msg->method == SOUP_METHOD_HEAD */
         {