new helper: file_inode(file)

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/arch/mips/lasat/picvue_proc.c b/arch/mips/lasat/picvue_proc.c
index 8e388da..c592bc8 100644
--- a/arch/mips/lasat/picvue_proc.c
+++ b/arch/mips/lasat/picvue_proc.c
@@ -64,7 +64,7 @@
 static ssize_t pvc_line_proc_write(struct file *file, const char __user *buf,
 				   size_t count, loff_t *pos)
 {
-	int lineno = *(int *)PDE(file->f_path.dentry->d_inode)->data;
+	int lineno = *(int *)PDE(file_inode(file))->data;
 	char kbuf[PVC_LINELEN];
 	size_t len;