Removed HallEffect.

Change-Id: I677387d5c03a0e274b9ce5332bc56af367b19113
diff --git a/frc971/wpilib/dma_edge_counting.h b/frc971/wpilib/dma_edge_counting.h
index 99ae80e..c145268 100644
--- a/frc971/wpilib/dma_edge_counting.h
+++ b/frc971/wpilib/dma_edge_counting.h
@@ -6,13 +6,12 @@
 
 #include "aos/common/macros.h"
 
-#include "frc971/wpilib/hall_effect.h"
-
 #include "DigitalInput.h"
 #include "Encoder.h"
 #include "AnalogInput.h"
 #include "Utility.h"
 #include "dma.h"
+#undef ERROR
 
 namespace frc971 {
 namespace wpilib {