numa: Make max_numa_nodeid static

Now the only code that uses the variable is inside numa.c.
Reviewed-by: NPaolo Bonzini <pbonzini@redhat.com>
Acked-by: NMichael S. Tsirkin <mst@redhat.com>
Signed-off-by: NEduardo Habkost <ehabkost@redhat.com>

include/sysemu/numa.h

@@ -8,9 +8,6 @@
 #include "sysemu/hostmem.h"
 
 extern int nb_numa_nodes;   /* Number of NUMA nodes */
-extern int max_numa_nodeid; /* Highest specified NUMA node ID, plus one.
-                             * For all nodes, nodeid < max_numa_nodeid
-                             */
 
 typedef struct node_info {
     uint64_t node_mem;

numa.c

@@ -45,8 +45,10 @@ QemuOptsList qemu_numa_opts = {
 };
 
 static int have_memdevs = -1;
+static int max_numa_nodeid; /* Highest specified NUMA node ID, plus one.
+                             * For all nodes, nodeid < max_numa_nodeid
+                             */
 int nb_numa_nodes;
-int max_numa_nodeid;
 NodeInfo numa_info[MAX_NODES];
 
 static void numa_node_parse(NumaNodeOptions *node, QemuOpts *opts, Error **errp)