mraa: Remove trailing whitespace/tabs from various parts

Signed-off-by: Brendan Le Foll <brendan.le.foll@intel.com>

api/mraa/iio.hpp

@@ -237,7 +237,7 @@ class Iio
             eventData.diff = different;
             handler->onIioEvent(eventData);
         }
-	}
+    }
 
     mraa_iio_context m_iio;
 };

docs/iio.md

@@ -1,9 +1,11 @@
-iio				{#iio}
+iio             {#iio}
 ===
 IIO is the kernel's framework for supporting sensors.
 ## Using dummy_iio driver
-For platforms without IIO hardware the iio_dummy driver can be used. You can add the driver by either rebuilding the kernel with IIO component enabled or just building the IIO modules and load them.
-You must add the following config fragment. Known to work for kernel 3.19 and later.
+For platforms without IIO hardware the iio_dummy driver can be used. You can
+add the driver by either rebuilding the kernel with IIO component enabled or
+just building the IIO modules and load them.  You must add the following config
+fragment. Known to work for kernel 3.19 and later.
 <pre><code>
 CONFIG_IIO_DUMMY_EVGEN=m
 CONFIG_IIO_SIMPLE_DUMMY=m

src/iio/iio.c

@@ -550,9 +550,9 @@ mraa_iio_create_trigger(mraa_iio_context dev, const char* trigger)
     if (stat(IIO_CONFIGFS_TRIGGER, &configfs_status) == 0) {
         memset(buf, 0, MAX_SIZE);
         snprintf(buf, MAX_SIZE, IIO_CONFIGFS_TRIGGER "%s", trigger);
-	// we actually don't care if this doesn't succeed, as it just means
-	// it's already been initialised
-	mkdir(buf, configfs_status.st_mode);
+    // we actually don't care if this doesn't succeed, as it just means
+    // it's already been initialised
+    mkdir(buf, configfs_status.st_mode);
     }
 
     return MRAA_ERROR_UNSPECIFIED;