Header bug fix

Summary: A last minute change created a compile error on the header.  This fixes the issue.

Differential Revision: D64370707

Author: metascroy

torchao/experimental/ops/linear_8bit_act_xbit_weight/packed_weights_header.h

@@ -11,26 +11,18 @@
 namespace torchao::ops::linear_8bit_act_xbit_weight {
 
 torchao::ops::PackedWeightsHeader get_packed_weights_header_universal(
-    int weight_nbit,
+    unsigned char weight_nbit,
     bool has_weight_zeros,
     bool has_bias,
-    int nr,
-    int kr,
-    int version = 1) {
-  TORCHAO_CHECK(
-      version >= 0 && version < 256, "version must be between 0 and 255");
-  TORCHAO_CHECK(
-      weight_nbit >= 1 && weight_nbit < 256,
-      "weight_nbit must be between 1 and 255");
+    unsigned short nr,
+    unsigned short kr,
+    unsigned char version = 1) {
   return torchao::ops::PackedWeightsHeader(
       torchao::ops::PackedWeightsFormat::linear_8bit_act_xbit_weight_universal,
-      {((static_cast<unsigned short>(version) << 8) |
-        static_cast<unsigned short>(weight_nbit)),
-       ((static_cast<unsigned short>(has_weight_zeros) << 8) |
-        static_cast<unsigned short>(has_bias)),
-       static_cast<unsigned short>(nr),
-       static_cast<unsigned short>(kr),
-       0,
+      {static_cast<unsigned short>((version << 8) | weight_nbit),
+       static_cast<unsigned short>((has_weight_zeros << 8) | has_bias),
+       nr,
+       kr,
        0,
        0,
        0});