vdpa: ifcvf: return err when fail to request config irq

We ignore the err of requesting config interrupt, fix this.

Fixes: e7991f37 ("ifcvf: implement config interrupt in IFCVF")
Cc: Zhu Lingshan <lingshan.zhu@intel.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
Link: https://lore.kernel.org/r/20200723091254.20617-1-jasowang@redhat.comSigned-off-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Zhu Lingshan <lingshan.zhu@intel.com>
Fixes: e7991f37 ("ifcvf: implement config interrupt in IFCVF")
Cc: Zhu Lingshan <a class="moz-txt-link-rfc2396E" href="mailto:lingshan.zhu@intel.com">&lt;lingshan.zhu@intel.com&gt;</a>
Signed-off-by: Jason Wang <a class="moz-txt-link-rfc2396E" href="mailto:jasowang@redhat.com">&lt;jasowang@redhat.com&gt;</a>
Tested-by: Maxime Coquelin <maxime.coquelin@redhat.com>

drivers/vdpa/ifcvf/ifcvf_main.c

@@ -78,6 +78,10 @@ static int ifcvf_request_irq(struct ifcvf_adapter *adapter)
 	ret = devm_request_irq(&pdev->dev, irq,
 			       ifcvf_config_changed, 0,
 			       vf->config_msix_name, vf);
+	if (ret) {
+		IFCVF_ERR(pdev, "Failed to request config irq\n");
+		return ret;
+	}
 
 	for (i = 0; i < IFCVF_MAX_QUEUE_PAIRS * 2; i++) {
 		snprintf(vf->vring[i].msix_name, 256, "ifcvf[%s]-%d\n",