loader: Fix leak of kernel driver name
This is strdup'd, it needs to be freed.
CID: 1458032 Fixes: f93bb2fb ("loader: Check if the kernel driver is i915 before loading iris")
This is strdup'd, it needs to be freed.
CID: 1458032 Fixes: f93bb2fb ("loader: Check if the kernel driver is i915 before loading iris")