[PATCH 0/3] Update tests for 'xfmemopen' and 'xfclose' use

[Maciej W. Rozycki]

Hi,

 Following a conversation with Adhemerval earlier on[1] here's a small 
patch series to convert tests for 'xfmemopen' use.

 I chose to add 'xfmemopen' with a change on its own so as to follow good 
coding practices, but also to aid with test backporting downstream, by not 
requiring to pull modifications to existing tests where a new test relies 
on 'xfmemopen'.

 In the course of making this update I've come across a couple of places
still using 'fclose' with no error checking or plain missing the call 
(including mine, sigh...), so I've added another patch on top.  It does 
depend on the change for 'xfmemopen' for mechanical reasons: either has to 
add #include <support/xstdio.h> where there's no such directive already.

 Verified natively with 'powerpc64le-linux-gnu' configuration.  OK to 
apply?

References:

[1] <https://inbox.sourceware.org/libc-alpha/3487d7be-2661-5e1e-2d6f-c949e1699df0@redhat.com/>

  Maciej