all: check stdout and stderr status at exit

If stream status is not checked at the end of execution below problem
would not report error, or non-zero exit code.  The uptime is just an
example same was true with all commands of the project.

$ uptime >&- ; echo $?
uptime: write error: Bad file descriptor
1
$ uptime >/dev/full ; echo $?
uptime: write error: No space left on device
1

Signed-off-by: Sami Kerola <kerolasa@iki.fi>

pwdx.c

@@ -30,6 +30,7 @@
 #include "c.h"
 #include "nls.h"
 #include "xalloc.h"
+#include "fileutils.h"
 
 static void __attribute__ ((__noreturn__)) usage(FILE * out)
 {
@@ -77,6 +78,7 @@ int main(int argc, char *argv[])
 	setlocale (LC_ALL, "");
 	bindtextdomain(PACKAGE, LOCALEDIR);
 	textdomain(PACKAGE);
+	atexit(close_stdout);
 
 	while ((ch = getopt_long(argc, argv, "Vh", longopts, NULL)) != -1)
 		switch (ch) {