switch debugfs to umode_t

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index f2bd275..660b069 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -4385,7 +4385,7 @@
 };
 
 struct dentry *trace_create_file(const char *name,
-				 mode_t mode,
+				 umode_t mode,
 				 struct dentry *parent,
 				 void *data,
 				 const struct file_operations *fops)