[XenPPC] [xenppc-unstable] [powerpc] Use new method to detect NULL xencomm handle

[Xen patchbot-xenppc-unstable <patchbot-xenppc-unstable@xxxxxxxxxxxxxxxxxxx>]

# HG changeset patch
# User Jimi Xenidis <jimix@xxxxxxxxxxxxxx>
# Node ID 9b1567ef3b2a810f991edf67cf3e1c7d70e9c5a8
# Parent  f77ff6eb8d221e8414bb632bba7276fede4903f1
[powerpc] Use new method to detect NULL xencomm handle

old method wasted cycles and could give false positive.

Signed-off-by: Jimi Xenidis <jimix@xxxxxxxxxxxxxx>
---
 xen/arch/powerpc/usercopy.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff -r f77ff6eb8d22 -r 9b1567ef3b2a xen/arch/powerpc/usercopy.c
--- a/xen/arch/powerpc/usercopy.c       Wed Jul 26 14:27:51 2006 -0400
+++ b/xen/arch/powerpc/usercopy.c       Thu Jul 27 18:57:34 2006 -0400
@@ -238,5 +238,5 @@ int xencomm_handle_is_null(void *ptr)
 
     desc = (struct xencomm_desc *)paddr_to_maddr((unsigned long)ptr);
 
-    return (desc->address[0] == XENCOMM_INVALID);
-}
+    return (desc->nr_addrs == 0);
+}

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