cpu: Initialize breakpoint/watchpoint lists in cpu_common_initfn()

One small step in the simplification of cpu_exec_init().

Reviewed-by: Igor Mammedov <imammedo@redhat.com>
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
Signed-off-by: Andreas Färber <afaerber@suse.de>
diff --git a/qom/cpu.c b/qom/cpu.c
index 108bfa2..56c53a8 100644
--- a/qom/cpu.c
+++ b/qom/cpu.c
@@ -313,6 +313,8 @@
     CPUClass *cc = CPU_GET_CLASS(obj);
 
     cpu->gdb_num_regs = cpu->gdb_num_g_regs = cc->gdb_num_core_regs;
+    QTAILQ_INIT(&cpu->breakpoints);
+    QTAILQ_INIT(&cpu->watchpoints);
 }
 
 static int64_t cpu_common_get_arch_id(CPUState *cpu)