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>

ps/display.c

@@ -36,6 +36,7 @@
 #include "../proc/version.h"
 #include "../proc/wchan.h"
 
+#include "../include/fileutils.h"
 #include "common.h"
 
 #ifndef SIGCHLD
@@ -531,6 +532,7 @@ static void fancy_spew(void){
 
 /***** no comment */
 int main(int argc, char *argv[]){
+  atexit(close_stdout);
   myname = strrchr(*argv, '/');
   if (myname) ++myname; else myname = *argv;