Make sure size is correct.

signed-off-by: jcarsey
reviewed-by: lgrosenb

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@11896 6f19259b-4bc3-4df7-8a09-765794883524

ShellPkg/Library/UefiShellDebug1CommandsLib/EfiCompress.c

@@ -113,6 +113,7 @@ ShellCommandRunEfiCompress (
           ASSERT_EFI_ERROR(Status);
           InBuffer = AllocateZeroPool((UINTN)InSize);
           ASSERT(InBuffer != NULL);
+          InSize2 = (UINTN)InSize;
           Status = gEfiShellProtocol->ReadFile(InShellFileHandle, &InSize2, InBuffer);
           InSize = InSize2;
           ASSERT_EFI_ERROR(Status);