is_computer_on() lives again as a true syscall.

Replaced the _kern_null syscall with _kern_is_computer_on.
is_computer_on_fire is a bit harder, since it returns a float from kernelland, which
at the moment isn't supported in haiku.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@20069 a95241bf-73f2-0310-859d-f6bbb57e9c96

src/system/libroot/os/system_info.c

@@ -21,7 +21,7 @@ _get_system_info(system_info *info, size_t size)
 int32
 is_computer_on(void)
 {
-	return 1;
+	return _kern_is_computer_on();
 }