fflush: correct buffer handling in __sflush

This fixes CVE-2014-8611 correctly.

The commit that purported to fix CVE-2014-8611 (805288c2f062) only hid
it behind another bug. Two later commits, 86a16ada1ea6 and
44cf1e5eb470, attempted to address this new bug but mostly just confused
the issue. This commit rolls back the three previous changes and fixes
CVE-2014-8611 correctly.

The key to understanding the bug (and the fix) is that _w has
different meanings for different stream modes. If the stream is
unbuffered, it is always zero. If the stream is fully buffered, it is
the amount of space remaining in the buffer (equal to the buffer size
when the buffer is empty and zero when the buffer is full). If the
stream is line-buffered, it is a negative number reflecting the amount
of data in the buffer (zero when the buffer is empty and negative buffer
size when the buffer is full).

At the heart of fflush(), we call the stream's write function in a
loop, where t represents the return value from the last call and n
the amount of data that remains to be written. When the write function
fails, we need to move the unwritten data to the top of the buffer
(unless nothing was written) and adjust _p (which points to the next
free location in the buffer) and _w accordingly. These variables have
already been set to the values they should have after a successful
flush, so instead of adjusting them down to reflect what was written,
we're adjusting them up to reflect what remains.

The bug was that while _p was always adjusted, we only adjusted _w
if the stream was fully buffered. The fix is to also adjust _w for
line-buffered streams. Everything else is just noise.

Fixes: 805288c2f062
Fixes: 86a16ada1ea6
Fixes: 44cf1e5eb470
Sponsored by: Klara, Inc.

(cherry picked from commit 1f90b4edffe815aebb35e74b79e10593b31f6b75)
(cherry picked from commit 1e99535be2ea9c0ef8bc57fc885e9c01fa95d2dd)
(cherry picked from commit ccdd8337f9cbd7d34e2e95df1440dd5f7225d0b4)
(cherry picked from commit 95fbce59c9f4ed4015b19a88491a37dac9d4e7d5)
(cherry picked from commit d09a3bf72c0b5f1779c52269671872368c99f02a)
(cherry picked from commit 92709431b14df6c0687446247ac57cfc189ee827)
(cherry picked from commit 6cb5690b3495741e9ece6f42ba4a85732932aa83)
(cherry picked from commit 3a2ea31568c81f7b29710abd3d3e1ada2fbeb6c9)

Approved by: so
Security: SA-23:15.stdio
Sponsored by: The FreeBSD Foundation