fix fputc and friends on read-only streams

[Eric Blake]

On 06/07/2011 11:57 AM, Eric Blake wrote:
> POSIX requires that ferror() and errno reflect any failed attempt to
> write to a read-only stream, but newlib wasn't reliably doing this:
> 
> 2011-06-07  Eric Blake  <eblake@redhat.com>
> 
> 	* libc/stdio/wsetup.c (__swsetup_r): Set errno on failure.

Ping.

-- 
Eric Blake   eblake@redhat.com    +1-801-349-2682
Libvirt virtualization library http://libvirt.org

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