Camera: fix NPE from bad requestID

This avoid NPE exception and accompanying logspam from binder
callbacks.

Test: N/A
Bug: 135268793
Change-Id: I729f4905c94698c95733570abe92ca3ba9163cc5

core/java/android/hardware/camera2/impl/CameraDeviceImpl.java

@@ -2337,6 +2337,12 @@ public class CameraDeviceImpl extends CameraDevice
             final CaptureCallbackHolder holder =
                     CameraDeviceImpl.this.mCaptureCallbackMap.get(requestId);
 
+            if (holder == null) {
+                Log.e(TAG, String.format("Receive capture error on unknown request ID %d",
+                        requestId));
+                return;
+            }
+
             final CaptureRequest request = holder.getRequest(subsequenceId);
 
             Runnable failureDispatch = null;