f2fs: return wrong error number on f2fs_quota_write

commit 4f31d26b0c17f2aae6a6afeb823a87e20671ab4b upstream.

This must return size, not error number.

Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
Git-commit: c65b214c
Git-repo: https://android.googlesource.com/kernel/common.git


Signed-off-by: Sahitya Tummala <stummala@codeaurora.org>