Bug 17021: Fix XSS in circ/returns.pl

Bug 17021: Fix XSS in circ/returns.pl

Test plan:
Enter the following in the barcode input:
<script>alert('XSS')</script>

=> Without this patch you will see the alert
=> With this patch, no more alert

Signed-off-by: Chris Cormack <chrisc@catalyst.net.nz>

Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>

Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>
(cherry picked from commit 12b4c83f5a5c11af635cae83e6837ff80dc02da7)
Signed-off-by: Frédéric Demians <f.demians@tamil.fr>
(cherry picked from commit 4f5121a99e063fc05fb19caac89e5a56b1ff0afb)
Signed-off-by: Julian Maurice <julian.maurice@biblibre.com>