Linux 3.10 compat: replace PDE()->data with PDE_DATA()

Linux kernel commit torvalds/linux@d9dda78b renamed PDE() to
PDE_DATA().  To handle this detect the prefered interface
and define a PDE_DATA() wrapper for consistency.

Signed-off-by: Yuxuan Shui <yshuiv7@gmail.com>
Signed-off-by: Richard Yao <ryao@gentoo.org>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Issue #257

module/spl/spl-kstat.c

@@ -33,6 +33,9 @@
 #endif
 
 #define SS_DEBUG_SUBSYS SS_KSTAT
+#ifndef HAVE_PDE_DATA
+#define PDE_DATA(x) (PDE(x)->data)
+#endif
 
 static spinlock_t kstat_lock;
 static struct list_head kstat_list;
@@ -359,7 +362,7 @@ proc_kstat_open(struct inode *inode, struct file *filp)
                 return rc;
 
         f = filp->private_data;
-        f->private = PDE(inode)->data;
+        f->private = PDE_DATA(inode);
 
         return rc;
 }