[pygobject] Fix a few set-but-not-used warnings.

[Tomeu Vizoso <tomeuv src gnome org>]

commit a8408cfd68cd5e7cdb0b8a83e107d9a0d828e4bd
Author: Will Thompson <will thompson collabora co uk>
Date:   Mon Jan 23 13:01:27 2012 +0000

    Fix a few set-but-not-used warnings.
    
    In a couple of cases, the variable in question was set to a value
    spelled out again later in the function.
    
    The 'sequence_cache' variable is re-declared five lines below.
    
    The return value of 'read' was previously completely ignored. The
    'gssize ret' variable was in fact added to squash an unused-result
    warning.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=668497

 gi/_glib/pygiochannel.c   |    2 +-
 gi/_glib/pygmainloop.c    |    3 +--
 gi/_gobject/pygobject.c   |    2 +-
 gi/pygi-marshal-cleanup.c |    2 --
 4 files changed, 3 insertions(+), 6 deletions(-)
---
diff --git a/gi/_glib/pygiochannel.c b/gi/_glib/pygiochannel.c
index 4f77e28..3921cac 100644
--- a/gi/_glib/pygiochannel.c
+++ b/gi/_glib/pygiochannel.c
@@ -477,7 +477,7 @@ py_io_channel_add_watch(PyObject *self, PyObject *args, PyObject *kwargs)
     data->user_data = user_data; Py_XINCREF(user_data);
     data->iochannel = self; Py_INCREF(self);
 
-    handler_id = g_io_add_watch_full(((PyGIOChannel *) self)->channel,
+    handler_id = g_io_add_watch_full(iochannel,
                                      priority, condition,
 				     pyg_iowatch_marshal, data,
 				     (GDestroyNotify) pyg_iowatch_data_free);
diff --git a/gi/_glib/pygmainloop.c b/gi/_glib/pygmainloop.c
index eb6775e..5dabef6 100644
--- a/gi/_glib/pygmainloop.c
+++ b/gi/_glib/pygmainloop.c
@@ -158,9 +158,8 @@ pyg_signal_watch_check(GSource *source)
     PySignalWatchSource *real_source = (PySignalWatchSource *)source;
     GPollFD *poll_fd = &real_source->fd;
     unsigned char dummy;
-    gssize ret;
     if (poll_fd->revents & G_IO_IN)
-	ret = read(poll_fd->fd, &dummy, 1);
+        (void) read(poll_fd->fd, &dummy, 1);
 #endif
 
     state = pyglib_gil_state_ensure();
diff --git a/gi/_gobject/pygobject.c b/gi/_gobject/pygobject.c
index 0f0e5e2..8020b40 100644
--- a/gi/_gobject/pygobject.c
+++ b/gi/_gobject/pygobject.c
@@ -1275,7 +1275,7 @@ pygobject_get_properties(PyGObject *self, PyObject *args)
 
         property_name = PYGLIB_PyUnicode_AsString(py_property);
 
-        pspec = g_object_class_find_property(G_OBJECT_GET_CLASS(self->obj),
+        pspec = g_object_class_find_property(class,
 					 property_name);
         if (!pspec) {
 	    PyErr_Format(PyExc_TypeError,
diff --git a/gi/pygi-marshal-cleanup.c b/gi/pygi-marshal-cleanup.c
index f80ebfa..20c5b4a 100644
--- a/gi/pygi-marshal-cleanup.c
+++ b/gi/pygi-marshal-cleanup.c
@@ -356,8 +356,6 @@ _pygi_marshal_cleanup_to_py_array (PyGIInvokeState *state,
                                    gpointer         data,
                                    gboolean         was_processed)
 {
-    PyGISequenceCache *sequence_cache = (PyGISequenceCache *)arg_cache;
-
     if (arg_cache->transfer == GI_TRANSFER_EVERYTHING ||
         arg_cache->transfer == GI_TRANSFER_CONTAINER) {
         GArray *array_;