Add missing " in comment.

Change-Id: If33d3a11a0b48403fc009688b9300c92e5494d94
Reviewed-on: https://boringssl-review.googlesource.com/7160
Reviewed-by: Adam Langley <agl@google.com>

crypto/rsa/rsa_asn1.c

diff --git a/crypto/rsa/rsa_asn1.c b/crypto/rsa/rsa_asn1.c
index 36f6ee0..1f3d6a2 100644
--- a/crypto/rsa/rsa_asn1.c
+++ b/crypto/rsa/rsa_asn1.c
@@ -236,7 +236,7 @@
   if (version == kVersionMulti) {
     /* Although otherPrimeInfos is written as OPTIONAL in RFC 3447, it later
      * says "[otherPrimeInfos] shall be omitted if version is 0 and shall
-     * contain at least one instance of OtherPrimeInfo if version is 1. The
+     * contain at least one instance of OtherPrimeInfo if version is 1." The
      * OPTIONAL is just so both versions share a single definition. */
     CBS other_prime_infos;
     if (!CBS_get_asn1(&child, &other_prime_infos, CBS_ASN1_SEQUENCE) ||