remove // comment confused with /**/ comment

Reference: /n/atom/patch/applied2013/fschknit
Date: Tue Aug 27 18:41:32 CES 2013
Signed-off-by: quanstro@quanstro.net

--- /sys/src/fs/port/chk.c	Tue Aug 27 18:41:21 2013
+++ /sys/src/fs/port/chk.c	Tue Aug 27 18:41:22 2013
@@ -1,6 +1,6 @@
 #include	"all.h"
 
-//* augmented Dentry */
+/* augmented Dentry */
 typedef struct {
 	Dentry	*d;
 	Off	qpath;