[pygtk] Fix pygtk_main_watch_check, copied from pygobject/glib/pygmainloop.c:pyg_signal_watch_check. Fixes b

[John Stowers <jstowers src gnome org>]

commit 4cbd3c031289775f365c247f949d91facac4ba82
Author: Dieter Verfaillie <dieterv optionexplicit be>
Date:   Thu Feb 3 13:44:10 2011 +0100

    Fix pygtk_main_watch_check, copied from pygobject/glib/pygmainloop.c:pyg_signal_watch_check.
    Fixes bug 640738 and 638780.

 gtk/gtk.override |    5 +++--
 1 files changed, 3 insertions(+), 2 deletions(-)
---
diff --git a/gtk/gtk.override b/gtk/gtk.override
index 75018f4..94309a6 100644
--- a/gtk/gtk.override
+++ b/gtk/gtk.override
@@ -1151,9 +1151,10 @@ pygtk_main_watch_check(GSource *source)
 #ifdef HAVE_PYSIGNAL_SETWAKEUPFD
     PySignalWatchSource *real_source = (PySignalWatchSource *)source;
     GPollFD *poll_fd = &real_source->fd;
-    int data_size = 0;
+    unsigned char dummy;
+    gssize ret;
     if (poll_fd->revents & G_IO_IN)
-        data_size = read(poll_fd->fd, 0, 1);
+        ret = read(poll_fd->fd, &dummy, 1);
 #endif
 
     state = pyg_gil_state_ensure();