[libsoup] soup-session: Fix a crash when destroying a NULL unpause source

[Philip Withnall <pwithnall src gnome org>]

commit 085f4e28907e91c5e5d6517c0205d4288167fd05
Author: Philip Withnall <philip tecnocode co uk>
Date:   Tue Jul 2 15:00:47 2013 +0100

    soup-session: Fix a crash when destroying a NULL unpause source
    
    Closes: https://bugzilla.gnome.org/show_bug.cgi?id=703461

 libsoup/soup-message-io.c |    3 +--
 1 files changed, 1 insertions(+), 2 deletions(-)
---
diff --git a/libsoup/soup-message-io.c b/libsoup/soup-message-io.c
index 928b73e..497fd06 100644
--- a/libsoup/soup-message-io.c
+++ b/libsoup/soup-message-io.c
@@ -1149,8 +1149,7 @@ io_unpause_internal (gpointer msg)
 
        g_return_val_if_fail (io != NULL, FALSE);
 
-       g_source_unref (io->unpause_source);
-       io->unpause_source = NULL;
+       g_clear_pointer (&io->unpause_source, g_source_unref);
        io->paused = FALSE;
 
        if (io->io_source)