fat: fix duplicate addition of ->llseek handler

Signed-off-by: OGAWA Hirofumi <hirofumi@mail.parknet.co.jp>
diff --git a/fs/fat/dir.c b/fs/fat/dir.c
index 67e0583..3a7f603 100644
--- a/fs/fat/dir.c
+++ b/fs/fat/dir.c
@@ -841,7 +841,6 @@
 	.compat_ioctl	= fat_compat_dir_ioctl,
 #endif
 	.fsync		= file_fsync,
-	.llseek		= generic_file_llseek,
 };
 
 static int fat_get_short_entry(struct inode *dir, loff_t *pos,