switch vfs_getattr() to struct path

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/drivers/base/firmware_class.c b/drivers/base/firmware_class.c
index b392b35..a2be09d 100644
--- a/drivers/base/firmware_class.c
+++ b/drivers/base/firmware_class.c
@@ -290,7 +290,7 @@
 static noinline_for_stack long fw_file_size(struct file *file)
 {
 	struct kstat st;
-	if (vfs_getattr(file->f_path.mnt, file->f_path.dentry, &st))
+	if (vfs_getattr(&file->f_path, &st))
 		return -1;
 	if (!S_ISREG(st.mode))
 		return -1;