Don't confuse TLS bidirectional shutdown on record type zero.

The bidi shutdown code uses type = 0 as a special signal value, but code
elsewhere doesn't account for this.

BUG=526437

Change-Id: I090cee421633d70ef3b84f4daa811608031b9ed9
Reviewed-on: https://boringssl-review.googlesource.com/5771
Reviewed-by: Adam Langley <agl@google.com>
1 file changed