[IA64] 'msg' may be used uninitialized in xpc_initiate_allocate()

Found by gcc4.1 and reported by Dean Nelson.

Signed-off-by: Tony Luck <tony.luck@intel.com>
diff --git a/arch/ia64/sn/kernel/xpc_channel.c b/arch/ia64/sn/kernel/xpc_channel.c
index d0abddd..8255a9b 100644
--- a/arch/ia64/sn/kernel/xpc_channel.c
+++ b/arch/ia64/sn/kernel/xpc_channel.c
@@ -1831,7 +1831,7 @@
 {
 	struct xpc_partition *part = &xpc_partitions[partid];
 	enum xpc_retval ret = xpcUnknownReason;
-	struct xpc_msg *msg;
+	struct xpc_msg *msg = NULL;
 
 
 	DBUG_ON(partid <= 0 || partid >= XP_MAX_PARTITIONS);