[PATCH][BZ #14516] Don't make ttyname fail if procfs is unavailable

[Siddhesh Poyarekar]

Ugh, sorry, I forgot to make an analogous change to ttyname_r. Here's
an updated patch with it. I have the testsuite running right now. OK to
commit if there are no regressions?

Regards,
Siddhesh

ChangeLog:

	[BZ #14516]
	* sysdeps/unix/sysv/linux/ttyname.c (ttyname): Don't return
	failure if reading from procfs failed.
	* sysdeps/unix/sysv/linux/ttyname_r.c (ttyname_r): Likewise.
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