crypto: add NULL check for SSL_new() result in SSLPointer::New

Add explicit NULL check for SSL_new() return value in SSLPointer::New(),
consistent with the pattern used by CipherCtxPointer::New().

Fixes a potential NULL pointer dereference when OpenSSL fails to allocate
an SSL structure under memory pressure (Coverity CID 15826735).

Fixes: #62774

Author: RoomWithOutRoof

deps/ncrypto/ncrypto.cc

@@ -2828,7 +2828,9 @@ SSL* SSLPointer::release() {
 
 SSLPointer SSLPointer::New(const SSLCtxPointer& ctx) {
   if (!ctx) return {};
-  return SSLPointer(SSL_new(ctx.get()));
+  SSL* ssl = SSL_new(ctx.get());
+  if (ssl == nullptr) return {};
+  return SSLPointer(ssl);
 }
 
 void SSLPointer::getCiphers(std::function<void(const char*)> cb) const {