Handle INVALID_SIGNATURE instead of INVALID_PADDING in rsa_verify_wrap()

Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
diff --git a/library/pk_wrap.c b/library/pk_wrap.c
index 02331c3..2447cf6 100644
--- a/library/pk_wrap.c
+++ b/library/pk_wrap.c
@@ -215,9 +215,9 @@
                               sig, sig_len );
     if( status != PSA_SUCCESS )
     {
-        if ( status == PSA_ERROR_INVALID_PADDING )
+        if ( status == PSA_ERROR_INVALID_SIGNATURE )
         {
-            ret = MBEDTLS_ERR_RSA_INVALID_PADDING;
+            ret = MBEDTLS_ERR_RSA_VERIFY_FAILED;
         }
         else
         {