tls: ignore .shutdown() syscall error

Quote from SSL_shutdown man page:

  The output of SSL_get_error(3) may be misleading,
  as an erroneous SSL_ERROR_SYSCALL may be flagged even though
  no error occurred.

Also, handle all other errors to prevent assertion in `ClearError()`.

1 files changed, 6 insertions, 0 deletions

diff --git a/lib/tls.js b/lib/tls.js
index 7bf0ca188..4441bd1d6 100644
--- a/lib/tls.js
+++ b/lib/tls.js
@@ -282,8 +282,14 @@ function onCryptoStreamFinish() {
       // NOTE: first call checks if client has sent us shutdown,
       // second call enqueues shutdown into the BIO.
       if (this.pair.ssl.shutdown() !== 1) {
+        if (this.pair.ssl && this.pair.ssl.error)
+          return this.pair.error();
+
         this.pair.ssl.shutdown();
       }
+
+      if (this.pair.ssl && this.pair.ssl.error)
+        return this.pair.error();
     }
   } else {
     debug('encrypted.onfinish');