nfs41: store minorversion in cb_compound_hdr_arg

Signed-off-by: Benny Halevy <bhalevy@panasas.com>
diff --git a/fs/nfs/callback.h b/fs/nfs/callback.h
index 88d2e11..51b15c2 100644
--- a/fs/nfs/callback.h
+++ b/fs/nfs/callback.h
@@ -26,6 +26,7 @@
 struct cb_compound_hdr_arg {
 	unsigned int taglen;
 	const char *tag;
+	unsigned int minorversion;
 	unsigned int callback_ident;
 	unsigned nops;
 };