fs/file_table.c: Update alloc_file() comment

/**

 * alloc_file - allocate and initialize a 'struct file'

 * @mnt: the vfsmount on which the file will reside

 * @dentry: the dentry representing the new file

 *

 * @path: the (dentry, vfsmount) pair for the new file

 * @mode: the mode with which the new file will be opened

 * @fop: the 'struct file_operations' for the new file

 *

 * Use this instead of get_empty_filp() to get a new

 * 'struct file'.  Do so because of the same initialization

 * pitfalls reasons listed for init_file().  This is a

 * preferred interface to using init_file().

 *

 * If all the callers of init_file() are eliminated, its

 * code should be moved into this function.

 */

struct file *alloc_file(struct path *path, fmode_t mode,

		const struct file_operations *fop)