Remove an incorrect "Fall through" comment.

src/lib/crypt_ops/crypto_digest.c

@@ -100,7 +100,7 @@ library_supports_digest(digest_algorithm_t alg)
   switch (alg) {
     case DIGEST_SHA1: /* Fall through */
     case DIGEST_SHA256: /* Fall through */
-    case DIGEST_SHA512: /* Fall through */
+    case DIGEST_SHA512:
       return true;
     case DIGEST_SHA3_256: /* Fall through */
     case DIGEST_SHA3_512: /* Fall through */