cifs: convert send_nt_cancel into a version specific op

For SMB2, this should be a no-op. Obviously if we wanted to do something
for the SMB2 case, we could also define an operation here for it.

Signed-off-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Pavel Shilovsky <piastry@etersoft.ru>
diff --git a/fs/cifs/cifsglob.h b/fs/cifs/cifsglob.h
index 812e22a..c41bf6d 100644
--- a/fs/cifs/cifsglob.h
+++ b/fs/cifs/cifsglob.h
@@ -154,7 +154,12 @@
 	Smb_1 = 1,
 };
 
+struct mid_q_entry;
+struct TCP_Server_Info;
+
 struct smb_version_operations {
+	int (*send_cancel)(struct TCP_Server_Info *, void *,
+			   struct mid_q_entry *);
 };
 
 struct smb_version_values {
@@ -718,7 +723,6 @@
 
 #endif
 
-struct mid_q_entry;
 
 /*
  * This is the prototype for the mid receive function. This function is for