log: WithLogger: remove redundant intermediate var

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
(cherry picked from commit 4a36022)
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>

log/context.go

@@ -103,8 +103,7 @@ func SetFormat(format string) error {
 // WithLogger returns a new context with the provided logger. Use in
 // combination with logger.WithField(s) for great effect.
 func WithLogger(ctx context.Context, logger *logrus.Entry) context.Context {
-	e := logger.WithContext(ctx)
-	return context.WithValue(ctx, loggerKey{}, e)
+	return context.WithValue(ctx, loggerKey{}, logger.WithContext(ctx))
 }
 
 // GetLogger retrieves the current logger from the context. If no logger is