posix file: Match newer warning wording

For compatibility with GNAT GPL 2017.

Change-Id: I1b4b914aa4964967b1c598ef5ca303410bd413ec
Signed-off-by: Nico Huber <nico.h@gmx.de>
Reviewed-on: https://review.coreboot.org/20256
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
diff --git a/ada/posix/hw-file.adb b/ada/posix/hw-file.adb
index ae0792b..40b445d 100644
--- a/ada/posix/hw-file.adb
+++ b/ada/posix/hw-file.adb
@@ -54,10 +54,10 @@
                   (if Writable then WRITE else 0),
          copy  => (if Map_Copy then 1 else 0));
    begin
-      pragma Warnings(GNAT, Off, """cpath"" modified*, but* never referenced",
+      pragma Warnings(GNAT, Off, """cpath"" modified*, but* referenced",
                       Reason => "Free() demands to set it to null_ptr");
       Free (cpath);
-      pragma Warnings(GNAT, On, """cpath"" modified*, but* never referenced");
+      pragma Warnings(GNAT, On, """cpath"" modified*, but* referenced");
       Success := ret = 0;
 
       pragma Debug (not Success, Debug.Put ("Mapping failed: "));