chore: cleanup redundant code (#2791)

Signed-off-by: guoguangwu <guoguangwug@gmail.com>

syft/pkg/license.go

@@ -146,9 +146,6 @@ func (s License) Merge(l License) (*License, error) {
 	if err != nil {
 		return nil, err
 	}
-	if err != nil {
-		return nil, err
-	}
 	if sHash != lHash {
 		return nil, fmt.Errorf("cannot merge licenses with different hash")
 	}

syft/source/stereoscopesource/image_source_provider.go

@@ -40,9 +40,6 @@ func (l stereoscopeImageSourceProvider) Provide(ctx context.Context) (source.Sou
 		Exclude:         l.cfg.Exclude,
 		Alias:           l.cfg.Alias,
 	}
-	if err != nil {
-		return nil, err
-	}
 	return New(img, cfg), nil
 }