[IA64] domain.c: eliminate warning when compiling CONFIG_NUMA=n

When compiling for non-NUMA variable "node" ended up not being used,
which solicits a warning from GCC.  Fix is to evluate cpu_to_node(i)
in place.  This has the effect of doing cpu_to_node(i) twice on NUMA,
but this is init code, so performance is not an issue (and even if
it were, you can just declare cpu_to_node() as being a pure function,
so the compiler can eliminate the second call).
Signed-off-by: David Mosberger-Tang <davidm@hpl.hp.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>

arch/ia64/kernel/domain.c

@@ -151,10 +151,9 @@ void __devinit arch_init_sched_domains(void)
 	 * Set up domains. Isolated domains just stay on the dummy domain.
 	 */
 	for_each_cpu_mask(i, cpu_default_map) {
-		int node = cpu_to_node(i);
 		int group;
 		struct sched_domain *sd = NULL, *p;
-		cpumask_t nodemask = node_to_cpumask(node);
+		cpumask_t nodemask = node_to_cpumask(cpu_to_node(i));
 
 		cpus_and(nodemask, nodemask, cpu_default_map);
 
@@ -172,7 +171,7 @@ void __devinit arch_init_sched_domains(void)
 
 		sd = &per_cpu(node_domains, i);
 		*sd = SD_NODE_INIT;
-		sd->span = sched_domain_node_span(node);
+		sd->span = sched_domain_node_span(cpu_to_node(i));
 		sd->parent = p;
 		cpus_and(sd->span, sd->span, cpu_default_map);
 #endif