BUGFIX: Fixed segmentation fault on CyaSSL_BIO_free().

In CyaSSL_BIO_new_socket() bio->mem is never initialized. This will cause freeing of unallocated memory in CyaSSL_BIO_free:

if (bio->mem)
  XFREE(bio->mem, 0, DYNAMIC_TYPE_OPENSSL);

since bio->mem is not NULL, resulting in a crash.

src/ssl.c

@@ -4012,6 +4012,8 @@ int CyaSSL_set_compression(CYASSL* ssl)
             bio->fd    = sfd;
             bio->prev  = 0;
             bio->next  = 0;
+            bio->mem   = NULL;
+            bio->memLen = 0;
         }
         return bio; 
     }