Bug 9312: Resolve error triggered by mutli-type return value.

Bug 9312: Resolve error triggered by mutli-type return value.

$results is 1 upon success or a hash on failure.
Rather than check %$results || %error, I changed it to
$results!=1 || %error. Strangely, this works without
messy warnings. I believe this resolves the problem Katrin
mentions in comment #43.

TEST PLAN
---------
0) Make sure the system preference patronimages is set to Allow.
1) Apply all the patches
2) Login to staff client
3) Tools -> Upload patron images (it's in the bottom left)
4) Choose an image file, browse for a photo, enter a patron #.
5) Click Upload
6) Click the card number link
   -- the uploaded photo should be visible on the left side of
      the screen.
7) Run koha qa test tools.

Signed-off-by: Bernardo Gonzalez Kriegel <bgkriegel@gmail.com>
Image uploaded without problems
No koha-qa errors

Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Tomas Cohen Arazi <tomascohen@gmail.com>