Fix possible unreachable code

Signed-off-by: gabor-mezei-arm <gabor.mezei@arm.com>
diff --git a/library/psa_crypto_driver_wrappers.c b/library/psa_crypto_driver_wrappers.c
index 6bf08d9..38d0e30 100644
--- a/library/psa_crypto_driver_wrappers.c
+++ b/library/psa_crypto_driver_wrappers.c
@@ -783,9 +783,9 @@
                                                 output,
                                                 output_size,
                                                 output_length ) );
-#endif /* MBEDTLS_PSA_BUILTIN_CIPHER */
-
+#else
             return( PSA_ERROR_NOT_SUPPORTED );
+#endif /* MBEDTLS_PSA_BUILTIN_CIPHER */
 
         /* Add cases for opaque driver here */
 #if defined(PSA_CRYPTO_ACCELERATOR_DRIVER_PRESENT)
@@ -865,9 +865,9 @@
                                                 output,
                                                 output_size,
                                                 output_length ) );
-#endif /* MBEDTLS_PSA_BUILTIN_CIPHER */
-
+#else
             return( PSA_ERROR_NOT_SUPPORTED );
+#endif /* MBEDTLS_PSA_BUILTIN_CIPHER */
 
         /* Add cases for opaque driver here */
 #if defined(PSA_CRYPTO_ACCELERATOR_DRIVER_PRESENT)