Element::set_clock() allows None for the clock parameter

gir-files/Gst-1.0.gir

@@ -14177,7 +14177,10 @@ MT safe.</doc>
             <doc xml:space="preserve">a #GstElement to set the clock for.</doc>
             <type name="Element" c:type="GstElement*"/>
           </instance-parameter>
-          <parameter name="clock" transfer-ownership="none">
+          <parameter name="clock"
+                     transfer-ownership="none"
+                     nullable="1"
+                     allow-none="1">
             <doc xml:space="preserve">the #GstClock to set for the element.</doc>
             <type name="Clock" c:type="GstClock*"/>
           </parameter>

gstreamer/src/auto/element.rs

@@ -146,7 +146,7 @@ pub trait ElementExt {
 
     fn set_bus<'a, P: Into<Option<&'a Bus>>>(&self, bus: P);
 
-    fn set_clock<P: IsA<Clock>>(&self, clock: &P) -> Result<(), glib::error::BoolError>;
+    fn set_clock<'a, P: IsA<Clock> + 'a, Q: Into<Option<&'a P>>>(&self, clock: Q) -> Result<(), glib::error::BoolError>;
 
     fn set_context(&self, context: &Context);
 
@@ -421,9 +421,11 @@ impl<O: IsA<Element> + IsA<glib::object::Object>> ElementExt for O {
         }
     }
 
-    fn set_clock<P: IsA<Clock>>(&self, clock: &P) -> Result<(), glib::error::BoolError> {
+    fn set_clock<'a, P: IsA<Clock> + 'a, Q: Into<Option<&'a P>>>(&self, clock: Q) -> Result<(), glib::error::BoolError> {
+        let clock = clock.into();
+        let clock = clock.to_glib_none();
         unsafe {
-            glib::error::BoolError::from_glib(ffi::gst_element_set_clock(self.to_glib_none().0, clock.to_glib_none().0), "Failed to set clock")
+            glib::error::BoolError::from_glib(ffi::gst_element_set_clock(self.to_glib_none().0, clock.0), "Failed to set clock")
         }
     }