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git: prevent infinite recursion with cyclic symlinks (thanks cosa)

--- a/sys/src/cmd/git/fs.c

+++ b/sys/src/cmd/git/fs.c

@@ -453,6 +453,9 @@

 			break;

 	}

 	free(path);

+	for(i = 0; o != nil && i < aux->ncrumb; i++)

+		if(crumb(aux, i)->obj == o)

+			return nil;

 	return o;

 }