fix error return format

accounts/abi/abigen/source2.go.tpl

@@ -145,7 +145,7 @@ var (
 				out{{$i}} := *abi.ConvertType(out[{{$i}}], new({{bindtype .Type $structs}})).(*{{bindtype .Type $structs}})
 				{{- end }}
 				{{- end}}
-				return {{range $i, $t := .Normalized.Outputs}}out{{$i}}, {{end}} err
+				return {{range $i, $t := .Normalized.Outputs}}out{{$i}}, {{end}} nil
                 {{- end}}
 			}
 		{{end}}

accounts/abi/bind/v2/internal/contracts/db/bindings.go

@@ -80,7 +80,7 @@ func (dB *DB) UnpackGet(data []byte) (*big.Int, error) {
 		return new(big.Int), err
 	}
 	out0 := abi.ConvertType(out[0], new(big.Int)).(*big.Int)
-	return out0, err
+	return out0, nil
 }
 
 // PackGetNamedStatParams is the Go binding used to pack the parameters required for calling
@@ -179,7 +179,7 @@ func (dB *DB) UnpackGetStatsStruct(data []byte) (DBStats, error) {
 		return *new(DBStats), err
 	}
 	out0 := *abi.ConvertType(out[0], new(DBStats)).(*DBStats)
-	return out0, err
+	return out0, nil
 }
 
 // PackInsert is the Go binding used to pack the parameters required for calling
@@ -204,7 +204,7 @@ func (dB *DB) UnpackInsert(data []byte) (*big.Int, error) {
 		return new(big.Int), err
 	}
 	out0 := abi.ConvertType(out[0], new(big.Int)).(*big.Int)
-	return out0, err
+	return out0, nil
 }
 
 // DBInsert represents a Insert event raised by the DB contract.

accounts/abi/bind/v2/internal/contracts/nested_libraries/bindings.go

@@ -89,7 +89,7 @@ func (c1 *C1) UnpackDo(data []byte) (*big.Int, error) {
 		return new(big.Int), err
 	}
 	out0 := abi.ConvertType(out[0], new(big.Int)).(*big.Int)
-	return out0, err
+	return out0, nil
 }
 
 // C2MetaData contains all meta data concerning the C2 contract.
@@ -157,7 +157,7 @@ func (c2 *C2) UnpackDo(data []byte) (*big.Int, error) {
 		return new(big.Int), err
 	}
 	out0 := abi.ConvertType(out[0], new(big.Int)).(*big.Int)
-	return out0, err
+	return out0, nil
 }
 
 // L1MetaData contains all meta data concerning the L1 contract.
@@ -209,7 +209,7 @@ func (l1 *L1) UnpackDo(data []byte) (*big.Int, error) {
 		return new(big.Int), err
 	}
 	out0 := abi.ConvertType(out[0], new(big.Int)).(*big.Int)
-	return out0, err
+	return out0, nil
 }
 
 // L2MetaData contains all meta data concerning the L2 contract.
@@ -264,7 +264,7 @@ func (l2 *L2) UnpackDo(data []byte) (*big.Int, error) {
 		return new(big.Int), err
 	}
 	out0 := abi.ConvertType(out[0], new(big.Int)).(*big.Int)
-	return out0, err
+	return out0, nil
 }
 
 // L2bMetaData contains all meta data concerning the L2b contract.
@@ -319,7 +319,7 @@ func (l2b *L2b) UnpackDo(data []byte) (*big.Int, error) {
 		return new(big.Int), err
 	}
 	out0 := abi.ConvertType(out[0], new(big.Int)).(*big.Int)
-	return out0, err
+	return out0, nil
 }
 
 // L3MetaData contains all meta data concerning the L3 contract.
@@ -371,7 +371,7 @@ func (l3 *L3) UnpackDo(data []byte) (*big.Int, error) {
 		return new(big.Int), err
 	}
 	out0 := abi.ConvertType(out[0], new(big.Int)).(*big.Int)
-	return out0, err
+	return out0, nil
 }
 
 // L4MetaData contains all meta data concerning the L4 contract.
@@ -427,7 +427,7 @@ func (l4 *L4) UnpackDo(data []byte) (*big.Int, error) {
 		return new(big.Int), err
 	}
 	out0 := abi.ConvertType(out[0], new(big.Int)).(*big.Int)
-	return out0, err
+	return out0, nil
 }
 
 // L4bMetaData contains all meta data concerning the L4b contract.
@@ -482,5 +482,5 @@ func (l4b *L4b) UnpackDo(data []byte) (*big.Int, error) {
 		return new(big.Int), err
 	}
 	out0 := abi.ConvertType(out[0], new(big.Int)).(*big.Int)
-	return out0, err
+	return out0, nil
 }

accounts/abi/bind/v2/internal/contracts/uint256arrayreturn/bindings.go

@@ -73,5 +73,5 @@ func (myContract *MyContract) UnpackGetNums(data []byte) ([5]*big.Int, error) {
 		return *new([5]*big.Int), err
 	}
 	out0 := *abi.ConvertType(out[0], new([5]*big.Int)).(*[5]*big.Int)
-	return out0, err
+	return out0, nil
 }