Fix NTC steinhart-hart issue

esphome/components/ntc/sensor.py

@@ -24,7 +24,7 @@ def validate_calibration_parameter(value):
         return cv.Schema({
             cv.Required(CONF_TEMPERATURE): cv.float_,
             cv.Required(CONF_VALUE): cv.float_,
-        })
+        })(value)
 
     value = cv.string(value)
     parts = value.split('->')

tests/test3.yaml

@@ -129,6 +129,13 @@ sensor:
       b_constant: 3950
       reference_resistance: 10k
       reference_temperature: 25°C
+  - platform: ntc
+    sensor: resist
+    name: NTC Sensor2
+    calibration:
+      - 10.0kOhm -> 25°C
+      - 27.219kOhm -> 0°C
+      - 14.674kOhm -> 15°C
   - platform: tcs34725
     red_channel:
       name: Red Channel