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/kernel/syscalls.c

@@ -147,12 +147,11 @@ out:
 
 
 static inline int
-_user_null()
+_user_is_computer_on(void)
 {
-	return 0;
+	return 1;
 }
 
-
 // map to the arch specific call
 
 static inline int64