Don't use a default "int" return type, gcc gives a warning about it.

Tools/bgen/bgen/bgenObjectDefinition.py

@@ -98,7 +98,7 @@ class ObjectDefinition(GeneratorGroup):
 			"Override this method to apply additional checks/conversions"
 	
 	def outputConvert(self):
-		Output("%s%s_Convert(PyObject *v, %s *p_itself)", self.static, self.prefix,
+		Output("%sint %s_Convert(PyObject *v, %s *p_itself)", self.static, self.prefix,
 				self.itselftype)
 		OutLbrace()
 		self.outputCheckConvertArg()