Conditionally include exit label

...on hash functions where the label was only added
due to the modifications required by this PR.

Signed-off-by: Thomas Daubney <thomas.daubney@arm.com>
diff --git a/library/psa_crypto.c b/library/psa_crypto.c
index a75bcc6..6112f0d 100644
--- a/library/psa_crypto.c
+++ b/library/psa_crypto.c
@@ -2379,7 +2379,9 @@
     LOCAL_OUTPUT_ALLOC(hash_external, hash_size, hash);
     status = psa_hash_finish_internal(operation, hash, hash_size, hash_length);
 
+#if defined(MBEDTLS_PSA_COPY_CALLER_BUFFERS)
 exit:
+#endif
     LOCAL_OUTPUT_FREE(hash_external, hash);
     return status;
 }
@@ -2440,7 +2442,9 @@
     status = psa_driver_wrapper_hash_compute(alg, input, input_length,
                                            hash, hash_size, hash_length);
 
+#if defined(MBEDTLS_PSA_COPY_CALLER_BUFFERS)
 exit:
+#endif
     LOCAL_INPUT_FREE(input_external, input);
     LOCAL_OUTPUT_FREE(hash_external, hash);
     return status;