tst-getcpu: decode errno when sched_getcpu fails

The tst-getcpu test is failing on ia64 platforms due to sched_getcpu
returning an error.  But the current test only considers -1 when it's
also ENOSYS.  Tweak the logic a bit to make the output clearer.

Signed-off-by: Mike Frysinger <vapier@gentoo.org>

ChangeLog

@@ -1,3 +1,8 @@
+2012-06-04  Mike Frysinger  <vapier@gentoo.org>
+
+	* sysdeps/unix/sysv/linux/tst-getcpu.c (do_test): Call perror when
+	cpu2 is -1 and errno is not ENOSYS.
+
 2012-06-04  H.J. Lu  <hongjiu.lu@intel.com>
 
 	[BZ #14117]

sysdeps/unix/sysv/linux/tst-getcpu.c

@@ -31,10 +31,15 @@ do_test (void)
 	  else
 	    {
 	      int cpu2 = sched_getcpu ();
-	      if (cpu2 == -1 && errno == ENOSYS)
+	      if (cpu2 == -1)
 		{
-		  puts ("getcpu syscall not implemented");
-		  return 0;
+		  if (errno == ENOSYS)
+		    {
+		      puts ("getcpu syscall not implemented");
+		      return 0;
+		    }
+		  perror ("getcpu failed");
+		  result = 1;
 		}
 	      if (cpu2 != cpu)
 		{