f2fs: do not unnecessarily null-terminate encrypted symlink data

Null-terminating the fscrypt_symlink_data on read is unnecessary because
it is not string data --- it contains binary ciphertext.
Signed-off-by: NEric Biggers <ebiggers@google.com>
Signed-off-by: NJaegeuk Kim <jaegeuk@kernel.org>

fs/f2fs/namei.c

@@ -1015,7 +1015,6 @@ static const char *f2fs_encrypted_get_link(struct dentry *dentry,
 	struct fscrypt_str cstr = FSTR_INIT(NULL, 0);
 	struct fscrypt_str pstr = FSTR_INIT(NULL, 0);
 	struct fscrypt_symlink_data *sd;
-	loff_t size = min_t(loff_t, i_size_read(inode), PAGE_SIZE - 1);
 	u32 max_size = inode->i_sb->s_blocksize;
 	int res;
 
@@ -1030,7 +1029,6 @@ static const char *f2fs_encrypted_get_link(struct dentry *dentry,
 	if (IS_ERR(cpage))
 		return ERR_CAST(cpage);
 	caddr = page_address(cpage);
-	caddr[size] = 0;
 
 	/* Symlink is encrypted */
 	sd = (struct fscrypt_symlink_data *)caddr;