vasprintf bugs

[Eric Blake]

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I noticed these while trying to implement vasnprintf.

2007-03-12  Eric Blake  <ebb9@byu.net>

	* libc/stdio/fvwrite.c (__sfvwrite_r): Fix reentrancy.
	* libc/stdio/vasprintf.c (vasprintf, _vasprintf_r): Pass failed
	allocation to caller.

- --
Don't work too hard, make some time for fun as well!

Eric Blake             ebb9@byu.net
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