Only return previous connection if possible

app/src/main/java/com/hiddenramblings/tagmo/bluetooth/GattService.kt

@@ -477,6 +477,7 @@ class GattService : Service() {
             Debug.verbose(Companion::class.java, "${serviceType.logTag} onMtuChange $mtu $status")
             if (status == BluetoothGatt.GATT_SUCCESS)
                 maxTransmissionUnit = mtu - 3
+            if (null == mBluetoothGatt) mBluetoothGatt = gatt
             when (serviceType) {
                 Nordic.DEVICE.BLUUP, Nordic.DEVICE.FLASK, Nordic.DEVICE.SLIDE -> {
                     listener?.onBluupServicesDiscovered()
@@ -578,7 +579,9 @@ class GattService : Service() {
         if (emptyAdapater || address == null) return false
 
         // Previously connected device.  Try to reconnect.
-        if (address == mBluetoothDeviceAddress) mBluetoothGatt?.let { return it.connect() }
+        mBluetoothGatt?.let {
+            if (address == mBluetoothDeviceAddress && it.connect()) return true
+        }
         val device = mBluetoothAdapter?.getRemoteDevice(address) ?: return false
         // We want to directly connect to the device, so we are setting the autoConnect
         // parameter to false.