nfsd: add NFSEXP_PNFS to the exflags array

Signed-off-by: J. Bruce Fields <bfields@redhat.com>
diff --git a/fs/nfsd/export.c b/fs/nfsd/export.c
index 2911f51..900c3ae 100644
--- a/fs/nfsd/export.c
+++ b/fs/nfsd/export.c
@@ -1158,6 +1158,7 @@
 	{ NFSEXP_NOSUBTREECHECK, {"no_subtree_check", ""}},
 	{ NFSEXP_NOAUTHNLM, {"insecure_locks", ""}},
 	{ NFSEXP_V4ROOT, {"v4root", ""}},
+	{ NFSEXP_PNFS, {"pnfs", ""}},
 	{ 0, {"", ""}}
 };