[PATCH] sysctl: make sure to terminate strings with a NUL

[PATCH] sysctl: make sure to terminate strings with a NUL

This is a slightly more complete fix for the previous minimal sysctl
string fix.  It always terminates the returned string with a NUL, even
if the full result wouldn't fit in the user-supplied buffer.

The returned length is the full untruncated length, so that you can
tell when truncation has occurred.

Signed-off-by: Linus Torvalds <torvalds@osdl.org>
[chrisw: inclusive of minimal fix so it's same as upstream]
Signed-off-by: Chris Wright <chrisw@sous-sol.org>