crypto: fix length argument to snprintf()

Introduced in commit d3d6cd3 ("src: improve SSL version extraction
logic".)

PR-URL: #23622
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Santiago Gimeno <santiago.gimeno@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Hitesh Kanwathirtha <digitalinfinity@gmail.com>
Reviewed-By: Richard Lau <riclau@uk.ibm.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Refael Ackermann <refack@gmail.com>

src/node_crypto.cc

@@ -5756,7 +5756,7 @@ std::string GetOpenSSLVersion() {
   const int start = search(OPENSSL_VERSION_TEXT, 0, ' ') + 1;
   const int end = search(OPENSSL_VERSION_TEXT + start, start, ' ') + 1;
   const int len = end - start;
-  snprintf(buf, len, "%.*s\n", len, &OPENSSL_VERSION_TEXT[start]);
+  snprintf(buf, sizeof(buf), "%.*s\n", len, &OPENSSL_VERSION_TEXT[start]);
   return std::string(buf);
 }