hostfs: hostfs_file_open: Fix a fd leak in hostfs_file_open

In case of a race between to callers of hostfs_file_open()
it can happen that a file describtor is leaked.
Signed-off-by: Richard Weinberger <richard@nod.at>

fs/hostfs/hostfs_kern.c

@@ -329,6 +329,7 @@ static int hostfs_file_open(struct inode *ino, struct file *file)
 	/* somebody else had handled it first? */
 	if ((mode & HOSTFS_I(ino)->mode) == mode) {
 		mutex_unlock(&HOSTFS_I(ino)->open_mutex);
+		close_file(&fd);
 		return 0;
 	}
 	if ((mode | HOSTFS_I(ino)->mode) != mode) {