refactor(internal/bpf): remove empty var block and use constants

internal/bpf/whitelist_attacher.go

@@ -12,10 +12,9 @@ import (
 const (
 	// Map name for the whitelist of syscalls.
 	syscallsWhitelistMapName = "syscall_whitelist"
+	intSz                    = 4
 )
 
-var ()
-
 func registerWhitelistedSyscalls(
 	log *slog.Logger,
 	maps map[string]*ebpf.Map,
@@ -30,10 +29,10 @@ func registerWhitelistedSyscalls(
 
 	for _, nbr := range bpfarch.WhitelistedSyscalls {
 		syscallName := bpfarch.IdToSyscall[nbr]
-		buf := make([]byte, 4)
+		buf := make([]byte, intSz)
 		binary.LittleEndian.PutUint32(buf, uint32(nbr))
 
-		placeholder := make([]byte, 4)
+		placeholder := make([]byte, intSz)
 		if err := syscallMap.Update(
 			buf,
 			placeholder,