Fix bug in metamethods

Author: adamlerer

.THCTensor.cu.swp

@@ -766,6 +766,9 @@ int THCudaTensor_checkGPU(THCState *state, unsigned int nTensors, ...)
  int valid = 1;
  for (unsigned int i = 0; i < nTensors; i++) {
  THCudaTensor* tensor = va_arg(args, THCudaTensor*);
+ if (tensor == NULL) {
+ continue;
+ }
  int tensorDev = THCudaTensor_getDevice(state, tensor);
  if (tensorDev != -1 && tensorDev != curDev) {
  valid = 0;