internal/pkg: correctly scrub substitute status

Scrubbing for status predates substitutes. This change fixes scrub handling of substitute status entries.

Signed-off-by: Ophestra <cat@gensokyo.uk>

internal/pkg/pkg.go

@@ -1107,19 +1107,28 @@ func (c *Cache) Scrub(checks int) error {
 				got := p.Get().(*Checksum)
 				defer p.Put(got)
 
-				if _, err := os.Stat(c.base.Append(
+				var ok bool
+				for _, name := range [...]string{
 					dirIdentifier,
-					ent.Name(),
-				).String()); err != nil {
-					if !errors.Is(err, os.ErrNotExist) {
-						addErr(dir.Append(ent.Name()), err)
+					dirSubstitute,
+				} {
+					if _, err := os.Stat(c.base.Append(
+						name,
+						ent.Name(),
+					).String()); err != nil {
+						if !errors.Is(err, os.ErrNotExist) {
+							addErr(dir.Append(ent.Name()), err)
+						}
+						continue
 					}
+					ok = true
+				}
+				if !ok {
 					seMu.Lock()
 					se.DanglingStatus = append(se.DanglingStatus, *want)
 					seMu.Unlock()
-					return false
 				}
-				return true
+				return ok
 			}}
 		}
 		wg.Wait()