external/boringssl: Sync to f21650709a6f76e829ddcc77fe221c9d6a5c12de.

This includes the following changes:

https://boringssl.googlesource.com/boringssl/+log/348f0d8db9c2a0eca0503ba654020209c579d552..f21650709a6f76e829ddcc77fe221c9d6a5c12de

Test: BoringSSL CTS Presubmits.
Change-Id: Ie6e99c3315c552068b5ea57e31b1af7ff94f9b0f
diff --git a/src/crypto/evp/digestsign.c b/src/crypto/evp/digestsign.c
index de41f87..6e4d305 100644
--- a/src/crypto/evp/digestsign.c
+++ b/src/crypto/evp/digestsign.c
@@ -196,8 +196,8 @@
 int EVP_DigestSign(EVP_MD_CTX *ctx, uint8_t *out_sig, size_t *out_sig_len,
                    const uint8_t *data, size_t data_len) {
   if (uses_prehash(ctx, evp_sign)) {
-    /* If |out_sig| is NULL, the caller is only querying the maximum output
-     * length. |data| should only be incorporated in the final call. */
+    // If |out_sig| is NULL, the caller is only querying the maximum output
+    // length. |data| should only be incorporated in the final call.
     if (out_sig != NULL &&
         !EVP_DigestSignUpdate(ctx, data, data_len)) {
       return 0;