When printing out an ASN.1 structure, if the type is an item template don't fall through and attempt to interpret as a primitive type. (Imported from upstream's 5dc1247a7494f50c88ce7492518bbe0ce6f124fa.) Change-Id: Ica39757792cbf3f83879953b67838927ddbdb809 Reviewed-on: https://boringssl-review.googlesource.com/4009 Reviewed-by: Adam Langley <agl@google.com>kris/onging/CECPQ3_patch15