Reorder blocks to avoid double negations

Convert `#if !... A #else B #endif` to `#if ... B #else A`. No semantic change.

Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
diff --git a/tests/include/test/psa_crypto_helpers.h b/tests/include/test/psa_crypto_helpers.h
index 39611a2..fae715c 100644
--- a/tests/include/test/psa_crypto_helpers.h
+++ b/tests/include/test/psa_crypto_helpers.h
@@ -432,12 +432,12 @@
  * This is like #PSA_DONE except it does nothing under the same conditions as
  * #AES_PSA_INIT.
  */
-#if !defined(MBEDTLS_CTR_DRBG_USE_PSA_CRYPTO)
-#define AES_PSA_INIT() ((void) 0)
-#define AES_PSA_DONE() ((void) 0)
-#else /* MBEDTLS_CTR_DRBG_USE_PSA_CRYPTO */
+#if defined(MBEDTLS_CTR_DRBG_USE_PSA_CRYPTO)
 #define AES_PSA_INIT()   PSA_INIT()
 #define AES_PSA_DONE()   PSA_DONE()
+#else /* MBEDTLS_CTR_DRBG_USE_PSA_CRYPTO */
+#define AES_PSA_INIT() ((void) 0)
+#define AES_PSA_DONE() ((void) 0)
 #endif /* MBEDTLS_CTR_DRBG_USE_PSA_CRYPTO */
 
 #endif /* PSA_CRYPTO_HELPERS_H */