Fix memory corruption when reading integers from cbor

Fix memory corruption when reading integers from cbor

When the cbor_value_get_*() function is called with a pointer to some int, it
should have the correct size. When we cast it to something else it is treated
as a pointer to an uint64_t in the function for example and them 64 bits gets
written to memory even with the real type is only 32 bit long. When the real
type is only 32 bit long some other memory gets overwritten. On Big endian
systems the least significant bits are cut of so in most cases 0 is read.

With this patch a value cast is used and the value is converted to the other size.

This is the same as in commit 0d64c7c95a5c11a9fb5201e729fd8c75da210c80
"security: fix reading of permission attribute from configuration"

Change-Id: If5965491241e25ebf60a22dc45d37d74a33cb02f
Signed-off-by: Hauke Mehrtens <hauke.mehrtens@intel.com>
Reviewed-on: https://gerrit.iotivity.org/gerrit/8925
Tested-by: jenkins-iotivity <jenkins-iotivity@opendaylight.org>
Reviewed-by: Randeep Singh <randeep.s@samsung.com>