cpumask: remove node_to_first_cpu

Everyone defines it, and only one person uses it
(arch/mips/sgi-ip27/ip27-nmi.c).  So just open code it there.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Cc: linux-mips@linux-mips.org
diff --git a/arch/mips/sgi-ip27/ip27-nmi.c b/arch/mips/sgi-ip27/ip27-nmi.c
index 64459e7..b174a51 100644
--- a/arch/mips/sgi-ip27/ip27-nmi.c
+++ b/arch/mips/sgi-ip27/ip27-nmi.c
@@ -219,7 +219,7 @@
 		if (i == 1000) {
 			for_each_online_node(node)
 				if (NODEPDA(node)->dump_count == 0) {
-					cpu = node_to_first_cpu(node);
+					cpu = cpumask_first(cpumask_of_node(node));
 					for (n=0; n < CNODE_NUM_CPUS(node); cpu++, n++) {
 						CPUMASK_SETB(nmied_cpus, cpu);
 						/*