Fix status variable type in mbedtls_psa_ecp_export_public_key_iop_setup()

Signed-off-by: Waleed Elmelegy <waleed.elmelegy@arm.com>
diff --git a/tf-psa-crypto/drivers/builtin/src/psa_crypto_ecp.c b/tf-psa-crypto/drivers/builtin/src/psa_crypto_ecp.c
index f92be5d..c5cd45d 100644
--- a/tf-psa-crypto/drivers/builtin/src/psa_crypto_ecp.c
+++ b/tf-psa-crypto/drivers/builtin/src/psa_crypto_ecp.c
@@ -670,7 +670,7 @@
     size_t private_key_len,
     const psa_key_attributes_t *private_key_attributes)
 {
-    psa_status_t status = PSA_ERROR_CORRUPTION_DETECTED;
+    int status = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
 
     status = mbedtls_psa_ecp_load_representation(
         psa_get_key_type(private_key_attributes),