Add C string helper to membuffer interface

I don't know why I didn't do this from the beginning.  We often build up
a membuffer and then want to use it as a C string.  You could do it by
hand by adding the zero byte at the end, but that's just annoying.

Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>

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