Fix errors

code/espurna/light.ino

@@ -1061,7 +1061,7 @@ void lightSetup() {
         const char * map = getSetting("myMapping", "").c_str();
         unsigned char channels = strlen(map);
         for (unsigned char i=0; i<channels; i++) {
-            _light_channel.push_back((channel_t) {0, false, true, 0, 0, 0, 0, 1, map[i] - '0'});
+            _light_channel.push_back((channel_t) {0, false, true, 0, 0, 0, 0, 1, (unsigned char) map[i] - '0'});
         }
 
     }

code/espurna/sensor.ino

@@ -850,8 +850,8 @@ void _sensorConfigure() {
     // Update filter sizes
     for (unsigned char i=0; i<_magnitudes.size(); i++) {
         sensor_magnitude_t magnitude = _magnitudes[i];
-        _magnitude.filter->resize(_sensor_report_every);
-        _magnitude.min_change = getSetting("tmpDelta", magnitude.type, 0).toFloat();
+        magnitude.filter->resize(_sensor_report_every);
+        magnitude.min_change = getSetting("tmpDelta", magnitude.type, 0).toFloat();
     }
 
     // Save settings