find: -type T was actually meaning ! -type T!
With this fix, "make mrproper" works correctly
diff --git a/findutils/find.c b/findutils/find.c
index bc285d3..f3f4d95 100644
--- a/findutils/find.c
+++ b/findutils/find.c
@@ -143,7 +143,7 @@
 #if ENABLE_FEATURE_FIND_TYPE
 SFUNC(type)
 {
-	return !((statbuf->st_mode & S_IFMT) == ap->type_mask);
+	return ((statbuf->st_mode & S_IFMT) == ap->type_mask);
 }
 #endif
 #if ENABLE_FEATURE_FIND_PERM