Fix uninitialized variable in quantized compressors (#205)

Both compressors have a can_quantize() check, which if ever doesn't
succeed would trigger:

> UnboundLocalError: cannot access local variable 'quantized_weight' where it is not associated with a value

Author: markmc

src/compressed_tensors/compressors/quantized_compressors/naive_quantized.py

@@ -93,9 +93,11 @@ def compress_weight(
                 args=quantization_args,
                 dtype=quantization_args.pytorch_dtype(),
             )
+        else:
+            quantized_weight = weight
 
-            if device is not None:
-                quantized_weight = quantized_weight.to(device)
+        if device is not None:
+            quantized_weight = quantized_weight.to(device)
 
         return {"weight": quantized_weight}
 

src/compressed_tensors/compressors/quantized_compressors/pack_quantized.py

@@ -94,6 +94,8 @@ def compress_weight(
                 args=quantization_args,
                 dtype=torch.int8,
             )
+        else:
+            quantized_weight = weight
 
         packed_weight = pack_to_int32(quantized_weight, quantization_args.num_bits)
         weight_shape = torch.tensor(weight.shape)