Fix coredump in XREFs under FUNCREF's

git-svn-id: file://localhost/svn/verilator/trunk/verilator@800 77ca24e4-aefa-0310-84f0-b9a241c72d87

src/V3Inline.cpp

@@ -353,6 +353,7 @@ private:
     virtual void visit(AstNodeFTaskRef* nodep, AstNUser*) {
 	// Cleanup link until V3LinkDot can correct it
 	nodep->taskp(NULL);
+	nodep->iterateChildren(*this);
     }
     // Nop's to speed up the loop
     virtual void visit(AstAlways* nodep, AstNUser*) {