fix C compiler warning about unused utility function

Cython/Compiler/FusedNode.py

@@ -571,6 +571,7 @@ class FusedCFuncDefNode(StatListNode):
 
         if all_buffer_types:
             self._buffer_declarations(pyx_code, decl_code, all_buffer_types)
+            env.use_utility_code(ExprNodes.import_utility_code)
 
         pyx_code.put_chunk(
             u"""
@@ -650,8 +651,6 @@ class FusedCFuncDefNode(StatListNode):
         self.synthesize_defnodes()
         self.stats.append(self.__signatures__)
 
-        env.use_utility_code(ExprNodes.import_utility_code)
-
     def analyse_expressions(self, env):
         """
         Analyse the expressions. Take care to only evaluate default arguments