[spice-gtk 1/2] Fix empty clipboard check

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SpiceGtkSession::clipboard_received_cb starts by checking if the
length of the X selection data is not 0. However, right after this check,
if gtk_selection_data_get_length() returned -1, it decides it got an
empty clipboard, sets the selection length to 0, and does not return
early.
This commit reworks the len == 0 / len == -1 checks to make sure we
always return early when we get no data from the clipboard.
---
 gtk/spice-gtk-session.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/gtk/spice-gtk-session.c b/gtk/spice-gtk-session.c
index 10bd762..26a0ecf 100644
--- a/gtk/spice-gtk-session.c
+++ b/gtk/spice-gtk-session.c
@@ -852,12 +852,12 @@ static void clipboard_received_cb(GtkClipboard *clipboard,
 
     g_object_get(s->main, "max-clipboard", &max_clipboard, NULL);
     len = gtk_selection_data_get_length(selection_data);
-    if (len == 0 || (max_clipboard != -1 && len > max_clipboard)) {
+    if (max_clipboard != -1 && len > max_clipboard) {
         g_warning("discarded clipboard of size %d (max: %d)", len, max_clipboard);
         return;
-    } else if (len == -1) {
-        SPICE_DEBUG("empty clipboard");
-        len = 0;
+    } else if (len <= 0) {
+        SPICE_DEBUG("discarding empty clipboard");
+        return;
     } else {
         atom = gtk_selection_data_get_data_type(selection_data);
         name = gdk_atom_name(atom);
-- 
2.1.0

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