[libgdata] core: Fix crashes on zero-length files

[Ondrej Holy <oholy src gnome org>]

commit 76e12748bd0e519caeeefd6e1ac7ce8086e63059
Author: Ondrej Holy <oholy redhat com>
Date:   Thu Aug 11 08:58:00 2016 +0200

    core: Fix crashes on zero-length files
    
    reached_eof is set too early and thus it may not be propagated properly
    in some cases, which may cause abortion when reading zero-length files.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=769727

 gdata/gdata-buffer.c |    8 ++++----
 1 files changed, 4 insertions(+), 4 deletions(-)
---
diff --git a/gdata/gdata-buffer.c b/gdata/gdata-buffer.c
index c8c1298..ce40f80 100644
--- a/gdata/gdata-buffer.c
+++ b/gdata/gdata-buffer.c
@@ -231,10 +231,6 @@ gdata_buffer_pop_data (GDataBuffer *self, guint8 *data, gsize length_requested,
 
        g_mutex_lock (&(self->mutex));
 
-       /* Set reached_eof */
-       if (reached_eof != NULL)
-               *reached_eof = self->reached_eof && length_requested >= self->total_length;
-
        if (self->reached_eof == TRUE && length_requested > self->total_length) {
                /* Return data up to the EOF */
                return_length = self->total_length;
@@ -259,6 +255,10 @@ gdata_buffer_pop_data (GDataBuffer *self, guint8 *data, gsize length_requested,
                return_length = length_requested;
        }
 
+       /* Set reached_eof */
+       if (reached_eof != NULL)
+               *reached_eof = self->reached_eof && length_requested >= self->total_length;
+
        /* Return if we haven't got any data to pop (i.e. if we were cancelled before even one chunk arrived) 
*/
        if (return_length == 0)
                goto done;