curl: Double free in tool_ssls_load()

Summary: There is a double-free bugs in toolsslsload, which can happen at line 83-84 or 129-130 toolssls.c: c curlfreeshmac; curlfreesdata; The root cause is that line 83-84 did not reset shmac and sdata to NULL. If the seesion is malformed, the double-free will be triggerd. No AI was used to fin...