Fix the error usage in cannon (#11368)

cannon/cmd/run.go

@@ -2,6 +2,7 @@ package cmd
 
 import (
 	"context"
+	"errors"
 	"fmt"
 	"os"
 	"os/exec"
@@ -375,7 +376,7 @@ func Run(ctx *cli.Context) error {
 	debugProgram := ctx.Bool(RunDebugFlag.Name)
 	if debugProgram {
 		if metaPath := ctx.Path(RunMetaFlag.Name); metaPath == "" {
-			return fmt.Errorf("cannot enable debug mode without a metadata file")
+			return errors.New("cannot enable debug mode without a metadata file")
 		}
 		if err := vm.InitDebug(); err != nil {
 			return fmt.Errorf("failed to initialize debug mode: %w", err)

cannon/mipsevm/program/patch.go

@@ -4,6 +4,7 @@ import (
 	"bytes"
 	"debug/elf"
 	"encoding/binary"
+	"errors"
 	"fmt"
 
 	"github.com/ethereum-optimism/optimism/cannon/mipsevm"
@@ -57,7 +58,7 @@ func PatchStack(st mipsevm.FPVMState) error {
 	sp := uint32(0x7f_ff_d0_00)
 	// allocate 1 page for the initial stack data, and 16KB = 4 pages for the stack to grow
 	if err := st.GetMemory().SetMemoryRange(sp-4*memory.PageSize, bytes.NewReader(make([]byte, 5*memory.PageSize))); err != nil {
-		return fmt.Errorf("failed to allocate page for stack content")
+		return errors.New("failed to allocate page for stack content")
 	}
 	st.GetRegistersRef()[29] = sp
 

cannon/mipsevm/testutil/mips.go

@@ -123,7 +123,7 @@ func EncodePreimageOracleInput(t *testing.T, wit *mipsevm.StepWitness, localCont
 		return input, nil
 	case preimage.PrecompileKeyType:
 		if localOracle == nil {
-			return nil, fmt.Errorf("local oracle is required for precompile preimages")
+			return nil, errors.New("local oracle is required for precompile preimages")
 		}
 		preimage := localOracle.GetPreimage(preimage.Keccak256Key(wit.PreimageKey).PreimageKey())
 		precompile := common.BytesToAddress(preimage[:20])