Fix common misspellings

Fixes generated by 'codespell' and manually reviewed.

Signed-off-by: Lucas De Marchi <lucas.demarchi@profusion.mobi>
diff --git a/drivers/video/display/display-sysfs.c b/drivers/video/display/display-sysfs.c
index f6a09ab..0c647d7 100644
--- a/drivers/video/display/display-sysfs.c
+++ b/drivers/video/display/display-sysfs.c
@@ -182,7 +182,7 @@
 	mutex_lock(&ddev->lock);
 	device_unregister(ddev->dev);
 	mutex_unlock(&ddev->lock);
-	// Mark device index as avaliable
+	// Mark device index as available
 	mutex_lock(&allocated_dsp_lock);
 	idr_remove(&allocated_dsp, ddev->idx);
 	mutex_unlock(&allocated_dsp_lock);