mlxsw: reg: Fix max temperature getting

Fix copy & paste error in MTPM unpack helper.

Fixes: 85926f87 ("mlxsw: reg: Add definition of temperature management registers")
Signed-off-by: NJiri Pirko <jiri@mellanox.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/ethernet/mellanox/mlxsw/reg.h

@@ -2684,7 +2684,7 @@ static inline void mlxsw_reg_mtmp_unpack(char *payload, unsigned int *p_temp,
 		*p_temp = MLXSW_REG_MTMP_TEMP_TO_MC(temp);
 	}
 	if (p_max_temp) {
-		temp = mlxsw_reg_mtmp_temperature_get(payload);
+		temp = mlxsw_reg_mtmp_max_temperature_get(payload);
 		*p_max_temp = MLXSW_REG_MTMP_TEMP_TO_MC(temp);
 	}
 	if (sensor_name)