constify alloc_file()

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/fs/file_table.c b/fs/file_table.c
index ad17e05..6d982b5 100644
--- a/fs/file_table.c
+++ b/fs/file_table.c
@@ -155,7 +155,7 @@ struct file *get_empty_filp(void)
  * @mode: the mode with which the new file will be opened
  * @fop: the 'struct file_operations' for the new file
  */
-struct file *alloc_file(struct path *path, fmode_t mode,
+struct file *alloc_file(const struct path *path, fmode_t mode,
 		const struct file_operations *fop)
 {
 	struct file *file;