Mbed TLS: Fix compile error with ECP alternative

Fix un-paired parenthesis when MBEDTLS_ECP_RANDOMIZE_MXZ_ALT is enabled

Author: ccli8

connectivity/mbedtls/source/ecp.c

@@ -2446,7 +2446,7 @@ static int ecp_randomize_mxz( const mbedtls_ecp_group *grp, mbedtls_ecp_point *P
 
 #if defined(MBEDTLS_ECP_RANDOMIZE_MXZ_ALT)
     if( mbedtls_internal_ecp_grp_capable( grp ) )
-        return( mbedtls_internal_ecp_randomize_mxz( grp, P, f_rng, p_rng );
+        return( mbedtls_internal_ecp_randomize_mxz( grp, P, f_rng, p_rng ) );
 #endif /* MBEDTLS_ECP_RANDOMIZE_MXZ_ALT */
 
     p_size = ( grp->pbits + 7 ) / 8;