constify path argument of trace_seq_path()

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/kernel/trace/trace_output.c b/kernel/trace/trace_output.c
index 0d6ff35..6909871 100644
--- a/kernel/trace/trace_output.c
+++ b/kernel/trace/trace_output.c
@@ -264,7 +264,7 @@
 	return ret;
 }
 
-int trace_seq_path(struct trace_seq *s, struct path *path)
+int trace_seq_path(struct trace_seq *s, const struct path *path)
 {
 	unsigned char *p;