Fix use-after-free errors in stdio_test.

fclose(3) frees the passed-in FILE*. We should close(2) the underlying fd,
not fclose(3) the stream, if we want to test what happens with a stream
we can't read from.

Bug: 14466691
Change-Id: I99fed5904b0266b9c6ae05d0b9cf2e926446c064
1 file changed