mapfile: export xdr_free_null_stream

Used in Ganesha FSAL_PROXY.

Signed-off-by: Matt Benjamin <mbenjamin@redhat.com>

(cherry picked from commit c1d28777080bdfea34be8b3b01e81cd26576050d)

BUG=none
TEST=libntirpc exports xdr_free_null_stream

Change-Id: I32b1dcc1c7ce28ee667d47372c1f55c9a15525f7
Signed-off-by: Chirantan Ekbote <chirantan@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/701668
Commit-Ready: Stephen Barber <smbarber@chromium.org>
Reviewed-by: Mike Frysinger <vapier@chromium.org>
diff --git a/src/libntirpc.map.in.cmake b/src/libntirpc.map.in.cmake
index 3a40d6a..2c23bf8 100644
--- a/src/libntirpc.map.in.cmake
+++ b/src/libntirpc.map.in.cmake
@@ -217,6 +217,7 @@
     xdr_dplx_msg;
     xdr_enum;
     xdr_float;
+    xdr_free_null_stream;
     xdr_hyper;
     xdr_inrec_cksum;
     xdr_inrec_create;