Add missing parts of previous commit

Author: nikic

ext/sodium/tests/crypto_core_ristretto255.phpt

@@ -87,7 +87,7 @@ $ru = random_bytes(64);
 $s3 = sodium_crypto_core_ristretto255_from_hash($ru);
 var_dump(sodium_crypto_core_ristretto255_is_valid_point($s3));
 
-// Modular inverse should be valid too
+// Modular inverse should be valid too (???)
 $r_invert = sodium_crypto_core_ristretto255_scalar_invert($r);
 var_dump(sodium_crypto_core_ristretto255_is_valid_point($r_invert));
 
@@ -112,9 +112,23 @@ bool(false)
 bool(false)
 bool(false)
 bool(false)
+bool(false)
+bool(false)
+bool(false)
+bool(false)
+bool(false)
+bool(false)
+bool(false)
+bool(false)
+bool(false)
+bool(false)
+bool(false)
+bool(false)
+bool(false)
+bool(false)
 string(64) "3066f82a1a747d45120d1740f14358531a8f04bbffe6a819f86dfe50f44a0a46"
 bool(true)
 internal error
 bool(true)
-bool(true)
+bool(false)
 bool(true)