Fixed a typo in the enum for unknown camera error message

Change-Id: Id9f8432e2ba8e1474ee020438d6456f1f450398a
diff --git a/include/camera/Camera.h b/include/camera/Camera.h
index c7f0b15..c95f31e 100644
--- a/include/camera/Camera.h
+++ b/include/camera/Camera.h
@@ -106,7 +106,7 @@
 
 // camera fatal errors
 enum {
-    CAMERA_ERROR_UKNOWN  = 1,
+    CAMERA_ERROR_UNKNOWN  = 1,
     CAMERA_ERROR_SERVER_DIED = 100
 };