constify alloc_file()

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

fs/file_table.c

@@ -155,7 +155,7 @@ over:
  * @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;

include/linux/file.h

@@ -17,7 +17,7 @@ struct file_operations;
 struct vfsmount;
 struct dentry;
 struct path;
-extern struct file *alloc_file(struct path *, fmode_t mode,
+extern struct file *alloc_file(const struct path *, fmode_t mode,
 	const struct file_operations *fop);
 
 static inline void fput_light(struct file *file, int fput_needed)