Merge pull request #15287 from OpenNuvoton/nuvoton_fix_ecp-load-curve448

Mbed TLS: Fix wrong MPI N in ECP Curve448 curve

Author: 0xc0170

connectivity/mbedtls/source/ecp_curves.c

@@ -770,6 +770,8 @@ int mbedtls_ecp_group_load( mbedtls_ecp_group *grp, mbedtls_ecp_group_id id )
     ECP_VALIDATE_RET( grp != NULL );
     mbedtls_ecp_group_free( grp );
 
+    mbedtls_ecp_group_init( grp );
+
     grp->id = id;
 
     switch( id )