accounts/abi/bind/v2: remove unecessary TODOs. Fix TestErrors compilation

accounts/abi/bind/v2/internal/contracts/events/contract.sol

@@ -11,7 +11,6 @@ contract C {
         uint256 data
     );
 
-    // TODO: consider log test where data is hashed?  maybe not necessary for v2 coverage
     function EmitOne() public {
         emit basic1(
             uint256(1),

accounts/abi/bind/v2/lib.go

@@ -165,7 +165,6 @@ func Transact(instance *ContractInstance, opts *bind.TransactOpts, input []byte)
 	return c.RawTransact(opts, input)
 }
 
-// TODO: test coverage for Call where the unpack method returns a pointer object.
 // Call performs an eth_call on the given bound contract instance, using the
 // provided abi-encoded input (or nil).
 func Call[T any](instance *ContractInstance, opts *bind.CallOpts, packedInput []byte, unpack func([]byte) (T, error)) (T, error) {

accounts/abi/bind/v2/lib_test.go

@@ -195,7 +195,6 @@ func TestDeploymentWithOverrides(t *testing.T) {
 		}
 	}
 
-	// TODO: constructor input packing should not return an error.
 	ctrct, err := nested_libraries.NewC1()
 	if err != nil {
 		panic(err)
@@ -395,7 +394,7 @@ func TestErrors(t *testing.T) {
 
 	ctrctABI, _ := solc_errors.CMetaData.GetAbi()
 	instance := ContractInstance{res.Addrs[solc_errors.CMetaData.Pattern], backend, *ctrctABI}
-	_, err = Call[struct{}](&instance, opts, packedInput, func(packed []byte) (*struct{}, error) { return nil, nil })
+	_, err = Call[struct{}](&instance, opts, packedInput, func(packed []byte) (struct{}, error) { return struct{}{}, nil })
 	if err == nil {
 		t.Fatalf("expected call to fail")
 	}