efi_loader: don't increment part twice per loop

Correct a mistake in the part number handling of commit
16a73b249d138fedeb188710533902ed7aac1ddc and only increment part once
per loop.

Signed-off-by: Jonathan Gray <jsg@jsg.id.au>
Tested-by: Peter Robinson <pbrobinson@gmail.com>
Signed-off-by: Alexander Graf <agraf@suse.de>
1 file changed