From: Daeho Jeong <daehojeong@xxxxxxxxxx>
Fixed null page reference when find_lock_page() fails in
redirty_blocks().
Signed-off-by: Daeho Jeong <daehojeong@xxxxxxxxxx>
Reported-by: Colin Ian King <colin.king@xxxxxxxxxxxxx>
Fixes: 5fdb322ff2c2 ("f2fs: add F2FS_IOC_DECOMPRESS_FILE and F2FS_IOC_COMPRESS_FILE")