* mmap.cc (mmap_record::alloc_fh): Initialize nmae strings in fdev to

empty strings or suffer a SEGV.  Drop second parameter in call to
	build_fh_dev.

winsup/cygwin/mmap.cc

@@ -522,8 +522,9 @@ mmap_record::alloc_fh ()
      of the correct type to be sure to call the method of the
      correct class. */
   device fdev;
+  fdev.name = fdev.native = "";
   fdev.parse (get_device ());
-  fhandler_base *fh = build_fh_dev (fdev, "");
+  fhandler_base *fh = build_fh_dev (fdev);
   fh->set_access (get_openflags ());
   return fh;
 }