f2fs: clean up xattr operation
1. don't allocate redundant memory in read_all_xattrs. 2. introduce RESERVED_XATTR_SIZE for cleanup. Signed-off-by: Chao Yu <yuchao0@huawei.com> Reviewed-by: Kinglong Mee <kinglongmee@gmail.com> Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
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