Code style fixes

***NO_CI***

Author: josesimoes

System.Device.Gpio/GpioController.cs

@@ -267,7 +267,7 @@ private void GpioControllerValueChanged(
             }
 
             // sanity check
-            if(gpioPin != null)
+            if (gpioPin != null)
             {
                 if (gpioPin.GpioEvents.HasFlag(PinEventTypes.Falling)
                     && e.ChangeType.HasFlag(PinEventTypes.Falling))
@@ -292,7 +292,7 @@ private void GpioControllerValueChanged(
         /// </summary>
         /// <param name="pinNumber">The pin number in the controller's numbering scheme</param>
         /// <param name="mode">The mode to be set.</param>
-        [MethodImpl(MethodImplOptions.InternalCall)] 
+        [MethodImpl(MethodImplOptions.InternalCall)]
         public extern void SetPinMode(
             int pinNumber,
             PinMode mode);

System.Device.Gpio/GpioPin.cs

@@ -143,7 +143,7 @@ public void SetPinMode(PinMode value)
                 // 2) throwing ArgumentException otherwise
                 // 3) store the requested pin mode in _pinMode field
                 NativeSetPinMode(value);
-            } 
+            }
         }
 
         /// <summary>