code-quality: Various improvements to code quality and thread safety

1 files changed, 4 insertions, 4 deletions

diff --git a/internal/perc/perc.go b/internal/perc/perc.go
index 9921ce4..63a171e 100644
--- a/internal/perc/perc.go
+++ b/internal/perc/perc.go
@@ -120,13 +120,13 @@ func ParseCalculation(input string) (*Calculation, error) {
 	registry.register(parseXIsWhatPercentOfY)
 	registry.register(parseXIsYPercentOfWhat)
 
-	calc, ok, err := registry.parse(input)
-	if ok {
-		return calc, nil
-	}
+	calc, _, err := registry.parse(input)
 	if err != nil {
 		return nil, err
 	}
+	if calc != nil {
+		return calc, nil
+	}
 
 	return nil, fmt.Errorf("perc: unable to parse input %q. See usage for examples", input)
 }