procfs: new helper - PDE_DATA(inode)

The only part of proc_dir_entry the code outside of fs/proc
really cares about is PDE(inode)->data.  Provide a helper
for that; static inline for now, eventually will be moved
to fs/proc, along with the knowledge of struct proc_dir_entry
layout.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/drivers/message/fusion/mptbase.c b/drivers/message/fusion/mptbase.c
index fb69baa..767ff4d 100644
--- a/drivers/message/fusion/mptbase.c
+++ b/drivers/message/fusion/mptbase.c
@@ -6656,7 +6656,7 @@
 
 static int mpt_summary_proc_open(struct inode *inode, struct file *file)
 {
-	return single_open(file, mpt_summary_proc_show, PDE(inode)->data);
+	return single_open(file, mpt_summary_proc_show, PDE_DATA(inode));
 }
 
 static const struct file_operations mpt_summary_proc_fops = {
@@ -6805,7 +6805,7 @@
 
 static int mpt_iocinfo_proc_open(struct inode *inode, struct file *file)
 {
-	return single_open(file, mpt_iocinfo_proc_show, PDE(inode)->data);
+	return single_open(file, mpt_iocinfo_proc_show, PDE_DATA(inode));
 }
 
 static const struct file_operations mpt_iocinfo_proc_fops = {