chore: A few small staticcheck fixes (sqlc-dev#2361)

Author: Jille

internal/cmd/generate.go

@@ -115,11 +115,11 @@ func readConfig(stderr io.Writer, dir, filename string) (string, *config.Config,
 	if err != nil {
 		switch err {
 		case config.ErrMissingVersion:
-			fmt.Fprintf(stderr, errMessageNoVersion)
+			fmt.Fprint(stderr, errMessageNoVersion)
 		case config.ErrUnknownVersion:
-			fmt.Fprintf(stderr, errMessageUnknownVersion)
+			fmt.Fprint(stderr, errMessageUnknownVersion)
 		case config.ErrNoPackages:
-			fmt.Fprintf(stderr, errMessageNoPackages)
+			fmt.Fprint(stderr, errMessageNoPackages)
 		}
 		fmt.Fprintf(stderr, "error parsing %s: %s\n", base, err)
 		return "", nil, err

internal/sql/catalog/schema.go

@@ -20,7 +20,7 @@ type Schema struct {
 
 func (s *Schema) getFunc(rel *ast.FuncName, tns []*ast.TypeName) (*Function, int, error) {
 	for i := range s.Funcs {
-		if strings.ToLower(s.Funcs[i].Name) != strings.ToLower(rel.Name) {
+		if !strings.EqualFold(s.Funcs[i].Name, rel.Name) {
 			continue
 		}
 

internal/sql/validate/param_ref.go

@@ -27,7 +27,7 @@ func ParamRef(n ast.Node) (map[int]bool, bool, error) {
 		}
 	}), n)
 	if dollar && nodollar {
-		return nil, false, errors.New("Can not mix $1 format with ? format")
+		return nil, false, errors.New("can not mix $1 format with ? format")
 	}
 
 	seen := map[int]bool{}