VMCI: remove set but not used variable 'cid'

Fixes gcc '-Wunused-but-set-variable' warning:

drivers/misc/vmw_vmci/vmci_host.c: In function 'vmci_host_do_alloc_queuepair':
drivers/misc/vmw_vmci/vmci_host.c:450:6: warning:
 variable 'cid' set but not used [-Wunused-but-set-variable]
  u32 cid;
      ^
Signed-off-by: YueHaibing <yuehaibing@huawei.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/misc/vmw_vmci/vmci_host.c

@@ -447,15 +447,12 @@ static int vmci_host_do_alloc_queuepair(struct vmci_host_dev *vmci_host_dev,
 	struct vmci_handle handle;
 	int vmci_status;
 	int __user *retptr;
-	u32 cid;
 
 	if (vmci_host_dev->ct_type != VMCIOBJ_CONTEXT) {
 		vmci_ioctl_err("only valid for contexts\n");
 		return -EINVAL;
 	}
 
-	cid = vmci_ctx_get_id(vmci_host_dev->context);
-
 	if (vmci_host_dev->user_version < VMCI_VERSION_NOVMVM) {
 		struct vmci_qp_alloc_info_vmvm alloc_info;
 		struct vmci_qp_alloc_info_vmvm __user *info = uptr;