gps: handle symlinks properly

We now delete anything that looks like a symlink if its called
"vendor" while pruning.

Hopefully, you didn't make a bad decision by relying on the magical
properties of symlinks.

Signed-off-by: Ibrahim AshShohail <ibra.sho@gmail.com>

gps/filesystem.go

@@ -104,13 +104,9 @@ func deriveFilesystemState(root string) (filesystemState, error) {
 			l := fsLink{path: relPath}
 
 			l.to, err = filepath.EvalSymlinks(path)
-			if strings.HasSuffix(err.Error(), "too many links") {
+			if err != nil && strings.HasSuffix(err.Error(), "too many links") {
 				l.circular = true
-			} else if err != nil {
-				return err
-			}
-
-			if _, err := os.Stat(l.to); os.IsNotExist(err) {
+			} else if err != nil && os.IsNotExist(err) {
 				l.broken = true
 			} else if err != nil {
 				return err