Always start at the top of the directory in SetPathCase()

* When uefi-md5sum is being chainloaded, we can't guarantee that the file system
  will not have some directories already opened, in which case directory listing
  may continue from an existing location when invoking SetPathCase(), instead of
  starting from the beginning of that directory.
* Alleviate this by always issuing a SetPosition(0) when entering a directory.

Md5SumPkg.inf

@@ -15,7 +15,7 @@
   BASE_NAME                  = Md5Sum
   FILE_GUID                  = 99A43E96-48DE-4B82-B726-83D6FB9A5AD9
   MODULE_TYPE                = UEFI_APPLICATION
-  VERSION_STRING             = 1.0
+  VERSION_STRING             = 1.1
   ENTRY_POINT                = efi_main
 
 [Sources]

src/boot.c

@@ -137,6 +137,9 @@ STATIC EFI_STATUS SetPathCase(
 	if (EFI_ERROR(Status))
 		goto out;
 
+	// Make sure we always start at the top of the directory list
+	FileHandle->SetPosition(FileHandle, 0);
+
 	do {
 		Size = FileInfoSize;
 		ZeroMem(FileInfo, Size);