[hal] Fix segfault in various HAL functions (#4891)

hal/src/main/native/sim/Encoder.cpp

@@ -53,7 +53,7 @@ bool GetEncoderBaseHandle(HAL_EncoderHandle handle,
                           HAL_FPGAEncoderHandle* fpgaHandle,
                           HAL_CounterHandle* counterHandle) {
   auto encoder = encoderHandles->Get(handle);
-  if (!handle) {
+  if (!encoder) {
     return false;
   }