multi: free sockhash on OOM

This would otherwise leak memory in the error path.

Detected by torture test 1540.

Closes #4713

diff --git a/lib/multi.c b/lib/multi.c
index cc11ea61768ab5d61f13266c9321f73e6ccda94f..6d819b4aaa7bad8505d441eea96be44f0f0ad83f 100755 (executable)
--- a/lib/multi.c
+++ b/lib/multi.c
@@ -260,6 +260,7 @@ static struct Curl_sh_entry *sh_addentry(struct curl_hash *sh,
 
   /* make/add new hash entry */
   if(!Curl_hash_add(sh, (char *)&s, sizeof(curl_socket_t), check)) {
+    Curl_hash_destroy(&check->transfers);
     free(check);
     return NULL; /* major failure */
   }