ia64: cleanup remove_siblinginfo()

remove_siblinginfo() initialises variable 'last', but never uses it.
Drop unneeded code.

CC: Ingo Molnar <mingo@kernel.org>
CC: Peter Zijlstra <peterz@infradead.org>
CC: Valentin Schneider <vschneid@redhat.com>
CC: linux-ia64@vger.kernel.org
CC: linux-kernel@vger.kernel.org
Signed-off-by: Yury Norov <yury.norov@gmail.com>
Acked-by: Andrew Morton <akpm@linux-foundation.org>

arch/ia64/kernel/smpboot.c

@@ -576,8 +576,6 @@ clear_cpu_sibling_map(int cpu)
 static void
 remove_siblinginfo(int cpu)
 {
-	int last = 0;
-
 	if (cpu_data(cpu)->threads_per_core == 1 &&
 	    cpu_data(cpu)->cores_per_socket == 1) {
 		cpumask_clear_cpu(cpu, &cpu_core_map[cpu]);
@@ -585,8 +583,6 @@ remove_siblinginfo(int cpu)
 		return;
 	}
 
-	last = (cpumask_weight(&cpu_core_map[cpu]) == 1 ? 1 : 0);
-
 	/* remove it from all sibling map's */
 	clear_cpu_sibling_map(cpu);
 }