Fix comments for conditional compilation

Signed-off-by: Przemek Stekiel <przemyslaw.stekiel@mobica.com>
diff --git a/include/mbedtls/psa_util.h b/include/mbedtls/psa_util.h
index c70e186..d718d69 100644
--- a/include/mbedtls/psa_util.h
+++ b/include/mbedtls/psa_util.h
@@ -509,6 +509,6 @@
 
 #endif /* !defined(MBEDTLS_PSA_CRYPTO_EXTERNAL_RNG) */
 
-#endif /* MBEDTLS_PSA_CRYPTO_C */
+#endif /* defined(MBEDTLS_USE_PSA_CRYPTO) || defined(MBEDTLS_SSL_PROTO_TLS1_3) */
 
 #endif /* MBEDTLS_PSA_UTIL_H */