tree 4e08fc2ba5d9d174882ca9ad40f43327e701db4c
parent d737278091fccda77f6896012ba86c5ffb57993f
author Eric Sandeen <sandeen@redhat.com> 1402551598 -0500
committer Chris Mason <clm@fb.com> 1402678348 -0700

btrfs: fix use of uninit "ret" in end_extent_writepage()

If this condition in end_extent_writepage() is false:

	if (tree->ops && tree->ops->writepage_end_io_hook)

we will then test an uninitialized "ret" at:

	ret = ret < 0 ? ret : -EIO;

The test for ret is for the case where ->writepage_end_io_hook
failed, and we'd choose that ret as the error; but if
there is no ->writepage_end_io_hook, nothing sets ret.

Initializing ret to 0 should be sufficient; if
writepage_end_io_hook wasn't set, (!uptodate) means
non-zero err was passed in, so we choose -EIO in that case.

Signed-of-by: Eric Sandeen <sandeen@redhat.com>

Signed-off-by: Chris Mason <clm@fb.com>