all: rename variables with lowercase-l/uppercase-I

See http://go/no-ell

Signed-off-by: Alex Chan <alexc@tailscale.com>

Updates #cleanup

Change-Id: I8c976b51ce7a60f06315048b1920516129cc1d5d

util/winutil/s4u/lsa_windows.go

@@ -256,8 +256,8 @@ func checkDomainAccount(username string) (sanitizedUserName string, isDomainAcco
 // errors.Is to check for it. When capLevel == CapCreateProcess, the logon
 // enforces the user's logon hours policy (when present).
 func (ls *lsaSession) logonAs(srcName string, u *user.User, capLevel CapabilityLevel) (token windows.Token, err error) {
-	if l := len(srcName); l == 0 || l > _TOKEN_SOURCE_LENGTH {
-		return 0, fmt.Errorf("%w, actual length is %d", ErrBadSrcName, l)
+	if ln := len(srcName); ln == 0 || ln > _TOKEN_SOURCE_LENGTH {
+		return 0, fmt.Errorf("%w, actual length is %d", ErrBadSrcName, ln)
 	}
 	if err := checkASCII(srcName); err != nil {
 		return 0, fmt.Errorf("%w: %v", ErrBadSrcName, err)

util/winutil/s4u/s4u_windows.go

@@ -938,10 +938,10 @@ func mergeEnv(existingEnv []string, extraEnv map[string]string) []string {
 		result = append(result, strings.Join([]string{k, v}, "="))
 	}
 
-	slices.SortFunc(result, func(l, r string) int {
-		kl, _, _ := strings.Cut(l, "=")
-		kr, _, _ := strings.Cut(r, "=")
-		return strings.Compare(kl, kr)
+	slices.SortFunc(result, func(a, b string) int {
+		ka, _, _ := strings.Cut(a, "=")
+		kb, _, _ := strings.Cut(b, "=")
+		return strings.Compare(ka, kb)
 	})
 	return result
 }