virsh: Fix vcpupin command output wrong vcpu pinning info

Commit 3072ded3 changed the waya to format the vcpu pinning info
and forget to get cpumap for each vcpu during the loop, that cause
vcpupin command will display vcpu 0 info for other vcpus.
Signed-off-by: NLuyao Huang <lhuang@redhat.com>

tools/virsh-domain.c

@@ -6954,7 +6954,8 @@ virshVcpuPinQuery(vshControl *ctl,
             if (got_vcpu && i != vcpu)
                 continue;
 
-            if (!(pinInfo = virBitmapDataFormat(cpumap, cpumaplen)))
+            if (!(pinInfo = virBitmapDataFormat(VIR_GET_CPUMAP(cpumap, cpumaplen, i),
+                                                cpumaplen)))
                 goto cleanup;
 
             if (virAsprintf(&vcpuStr, "%zu", i) < 0)