x86, uv: fix cpumask iterator in uv_bau_init()

Impact: fix boot crash on UV systems

Commit 76ba0ecda0de9accea9a91cb6dbde46782110e1c "cpumask: use
cpumask_var_t in uv_flush_tlb_others" used cur_cpu as an iterator;
it was supposed to be zero for the code below it.

Reported-by: Cliff Wickman <cpw@sgi.com>
Original-From: Cliff Wickman <cpw@sgi.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Acked-by: Mike Travis <travis@sgi.com>
Cc: steiner@sgi.com
Cc: <stable@kernel.org>
LKML-Reference: <200903180822.31196.rusty@rustcorp.com.au>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

arch/x86/kernel/tlb_uv.c

@@ -750,7 +750,7 @@ static int __init uv_bau_init(void)
 	int node;
 	int nblades;
 	int last_blade;
-	int cur_cpu = 0;
+	int cur_cpu;
 
 	if (!is_uv_system())
 		return 0;
@@ -760,6 +760,7 @@ static int __init uv_bau_init(void)
 	uv_mmask = (1UL << uv_hub_info->n_val) - 1;
 	nblades = 0;
 	last_blade = -1;
+	cur_cpu = 0;
 	for_each_online_node(node) {
 		blade = uv_node_to_blade_id(node);
 		if (blade == last_blade)