curl: Replaced old error handling with error reporting API.

Signed-off-by: Maria Kustova <maria.k@catit.be>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
diff --git a/block/curl.c b/block/curl.c
index 1b9b1f6..6731d28 100644
--- a/block/curl.c
+++ b/block/curl.c
@@ -543,7 +543,7 @@
     return 0;
 
 out:
-    fprintf(stderr, "CURL: Error opening file: %s\n", state->errmsg);
+    error_setg(errp, "CURL: Error opening file: %s", state->errmsg);
     curl_easy_cleanup(state->curl);
     state->curl = NULL;
 out_noclean: