qemu-img allows up to 16 coroutines when performing IO. Ensure that
there is a Curl socket and ACB available to each of them.

Signed-off-by: David Edmondson <david.edmondson@oracle.com>
---
 block/curl.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/block/curl.c b/block/curl.c
index 27fa77c351..8ee314739a 100644
--- a/block/curl.c
+++ b/block/curl.c
@@ -60,8 +60,8 @@ static CURLMcode __curl_multi_socket_action(CURLM *multi_handle,
 #define PROTOCOLS (CURLPROTO_HTTP | CURLPROTO_HTTPS | \
                    CURLPROTO_FTP | CURLPROTO_FTPS)
 
-#define CURL_NUM_STATES 8
-#define CURL_NUM_ACB    8
+#define CURL_NUM_STATES 16
+#define CURL_NUM_ACB    16
 #define CURL_TIMEOUT_MAX 10000
 
 #define CURL_BLOCK_OPT_URL       "url"
-- 
2.27.0