hdata/paca: Check for dt_find_property() return value
hdata/paca: Check for dt_find_property() return value

dt_find_property() might return NULL. In handle_capp_recoverable,
check for return value, before dereferencing it.

Fixes Coverity defect#97844.

Signed-off-by: Kamalesh Babulal <30b3129b1a1b0120e30fdc2f7d8e6560be5d0735@linux.vnet.ibm.com>
Signed-off-by: Stewart Smith <ec31ab75ddf977353c8f660f92ea8b23f64aef25@linux.vnet.ibm.com>

shenki/skiboot,csmart/skiboot,open-power/skiboot,stewart-ibm/skiboot,apopple/skiboot,shenki/skiboot,stewart-ibm/skiboot,legoater/skiboot,apopple/skiboot,legoater/skiboot,qemu/skiboot,mikey/skiboot,csmart/skiboot,qemu/skiboot,open-power/skiboot,legoater/skiboot,ddstreet/skiboot,qemu/skiboot,shenki/skiboot,apopple/skiboot,csmart/skiboot,ddstreet/skiboot,open-power/skiboot,stewart-ibm/skiboot,legoater/skiboot,open-power/skiboot,ddstreet/skiboot,shenki/skiboot,open-power/skiboot,legoater/skiboot,shenki/skiboot,mikey/skiboot,qemu/skiboot,mikey/skiboot,qemu/skiboot