[sysprof] libsysprof: add missing new func

[Christian Hergert <chergert src gnome org>]

commit c7b4465e279add4d17806943ee09be87e6e8752f
Author: Christian Hergert <chergert redhat com>
Date:   Fri May 24 17:15:38 2019 -0700

    libsysprof: add missing new func

 src/libsysprof/sysprof-tracefd-source.c | 6 ++++++
 1 file changed, 6 insertions(+)
---
diff --git a/src/libsysprof/sysprof-tracefd-source.c b/src/libsysprof/sysprof-tracefd-source.c
index dba0b56..6cbf1f0 100644
--- a/src/libsysprof/sysprof-tracefd-source.c
+++ b/src/libsysprof/sysprof-tracefd-source.c
@@ -290,3 +290,9 @@ source_iface_init (SysprofSourceInterface *iface)
   iface->set_writer = sysprof_tracefd_source_set_writer;
   iface->stop = sysprof_tracefd_source_stop;
 }
+
+SysprofSource *
+sysprof_tracefd_source_new (void)
+{
+  return g_object_new (SYSPROF_TYPE_TRACEFD_SOURCE, NULL);
+}