fix(cos): [126837414] tencentcloud_cos_bucket optmize delete function code logic (#3498)

* add

* add

* add

Author: SevenEarth

.changelog/3498.txt

@@ -0,0 +1,3 @@
+```release-note:enhancement
+resource/tencentcloud_cos_bucket: optmize delete function code logic
+```

tencentcloud/services/cos/resource_tc_cos_bucket.go

@@ -1069,7 +1069,7 @@ func resourceTencentCloudCosBucketDelete(d *schema.ResourceData, meta interface{
 	// wait for bucket 404, means deleted
 	err = resource.Retry(tccommon.ReadRetryTimeout, func() *resource.RetryError {
 		code, _, e := cosService.TencentcloudHeadBucket(ctx, bucket, cdcId)
-		if err != nil {
+		if e != nil {
 			if code == 404 {
 				log.Printf("[WARN]%s bucket (%s) not found, error code (404)", logId, bucket)
 				return nil
@@ -1078,7 +1078,7 @@ func resourceTencentCloudCosBucketDelete(d *schema.ResourceData, meta interface{
 			}
 		}
 
-		return nil
+		return resource.RetryableError(fmt.Errorf("Waiting for cos bucket [%s] deleted...", bucket))
 	})
 
 	if err != nil {