Fix spelling errors
diff --git a/src/compositor-drm.c b/src/compositor-drm.c
index e41254b..96d6611 100644
--- a/src/compositor-drm.c
+++ b/src/compositor-drm.c
@@ -667,7 +667,7 @@
 
 	/*
 	 * Calculate the source & dest rects properly based on actual
-	 * postion (note the caller has called weston_surface_update_transform()
+	 * position (note the caller has called weston_surface_update_transform()
 	 * for us already).
 	 */
 	pixman_region32_init(&dest_rect);