all: Remove trailing newlines from g_message()/g_warning()/g_error()s

All those logging functions already add a newline to any message they
print, so there’s no need to add a trailing newline in the message
passed to them.

Signed-off-by: Philip Withnall <withnall@endlessm.com>
Reviewed-by: nobody

glib/glib-unix.c

@@ -301,7 +301,7 @@ g_unix_fd_source_dispatch (GSource     *source,
 
   if (!callback)
     {
-      g_warning ("GUnixFDSource dispatched without callback\n"
+      g_warning ("GUnixFDSource dispatched without callback. "
                  "You must call g_source_set_callback().");
       return FALSE;
     }