kvm-all: don't use stale dbg_data->cpu

The changes to run_on_cpu and friends mean that all helpers are passed
the CPUState of vCPU they are running on. The conversion missed the
field in commit e0eeb4a2 which
introduced bugs.
Reported-by: NClaudio Imbrenda <imbrenda@linux.vnet.ibm.com>
Tested-by: NClaudio Imbrenda <imbrenda@linux.vnet.ibm.com>
Signed-off-by: NAlex Bennée <alex.bennee@linaro.org>
Message-Id: <20161010154625.14881-1-alex.bennee@linaro.org>
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>

kvm-all.c

@@ -2215,15 +2215,14 @@ int kvm_sw_breakpoints_active(CPUState *cpu)
 
 struct kvm_set_guest_debug_data {
     struct kvm_guest_debug dbg;
-    CPUState *cpu;
     int err;
 };
 
-static void kvm_invoke_set_guest_debug(CPUState *unused_cpu, void *data)
+static void kvm_invoke_set_guest_debug(CPUState *cpu, void *data)
 {
     struct kvm_set_guest_debug_data *dbg_data = data;
 
-    dbg_data->err = kvm_vcpu_ioctl(dbg_data->cpu, KVM_SET_GUEST_DEBUG,
+    dbg_data->err = kvm_vcpu_ioctl(cpu, KVM_SET_GUEST_DEBUG,
                                    &dbg_data->dbg);
 }