Fix inability to boot Catalina by reverting VBoxHFS commit 28e2749404

Makefile

@@ -136,6 +136,7 @@ $(OPENCORE_UDK_BUILD_DIR)/Bootstrap.efi $(OPENCORE_UDK_BUILD_DIR)/Shell.efi \
 $(OPENCORE_UDK_BUILD_DIR)/ResetSystem.efi $(OPENCORE_UDK_BUILD_DIR)/OpenCanopy.efi \
 $(OPENCORE_UDK_BUILD_DIR)/VBoxHfs.efi \
  :
+	cd src/OpenCorePkg && patch -p1 --forward < ../0001-vboxhfs.patch || true
 	cd src/OpenCorePkg && ARCHS=X64 ./build_oc.tool --skip-package $(OPENCORE_MODE)
 
 # Tools

src/0001-vboxhfs.patch

@@ -0,0 +1,27 @@
+diff --git a/Staging/VBoxHfs/fsw_hfs.c b/Staging/VBoxHfs/fsw_hfs.c
+index a5b3565d..9ca3d0f1 100644
+--- a/Staging/VBoxHfs/fsw_hfs.c
++++ b/Staging/VBoxHfs/fsw_hfs.c
+@@ -1042,20 +1042,20 @@ fsw_hfs_cmpf_catkey (BTreeKey *btkey1, BTreeKey *btkey2)
+
+ 		for (ac = 0; ac == 0 && apos < ckey1nlen; apos++) {
+ 			ac = be16_to_cpu (p1[apos]);
+-			ac = fsw_to_lower (ac);
++			ac = ac ? fsw_to_lower (ac) : 0xFFFF;
+ 		}
+
+ 		/* get next valid character from ckey2 */
+
+ 		for (bc = 0; bc == 0 && bpos < ckey2nlen; bpos++) {
+ 			bc = p2[bpos];
+-			bc = fsw_to_lower (bc);
++			bc = bc ? fsw_to_lower (bc) : 0xFFFF;
+ 		}
+
+ 		if (ac != bc)
+ 			break;
+
+-		if (ac == 0)
++		if (bpos == ckey1nlen)
+ 			return 0;
+ 	}