take check for new events in namespace (guts of mounts_poll()) to namespace.c

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/include/linux/mnt_namespace.h b/include/linux/mnt_namespace.h
index d74785c..0b89efc 100644
--- a/include/linux/mnt_namespace.h
+++ b/include/linux/mnt_namespace.h
@@ -35,6 +35,7 @@
 extern const struct seq_operations mounts_op;
 extern const struct seq_operations mountinfo_op;
 extern const struct seq_operations mountstats_op;
+extern int mnt_had_events(struct proc_mounts *);
 
 #endif
 #endif