f2fs: remove unreachable code in f2fs_encrypt_one_page()

f2fs: remove unreachable code in f2fs_encrypt_one_page()

Since commit 52e7e0d88933 ("fscrypt: Switch to sync_skcipher and
on-stack requests") eliminated the dynamic allocation of crypto
requests, the only remaining dynamic memory allocation done by
fscrypt_encrypt_pagecache_blocks() is the bounce page allocation.

The bounce page is allocated from a mempool.  Mempool allocations with
GFP_NOFS never fail.  Therefore, fscrypt_encrypt_pagecache_blocks() can
no longer return -ENOMEM when passed GFP_NOFS.

Remove the now-unreachable code from f2fs_encrypt_one_page().

Suggested-by: Vlastimil Babka <vbabka@suse.cz>
Link: https://lore.kernel.org/all/d9dc2ee1-283d-4467-ad36-a6a4aa557589@suse.cz/
Signed-off-by: Eric Biggers <ebiggers@kernel.org>
Acked-by: Vlastimil Babka (SUSE) <vbabka@kernel.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Chao Yu <chao@kernel.org>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>