crt: fix kernel_get_vmem_protection return prot

[illusionyy]

at least on xom process, like shellcore, this used to return -1 when querying on mapbase. haven't check on bc mode apps.

dynlib_obj_t temp_obj = {};
kernel_dynlib_obj(pid, 0, &temp_obj);
start = temp_obj.mapbase;
start_size = temp_obj.mapsize;
prot = kernel_get_vmem_protection(pid, start, start_size); // returned -1

this changelist

dynlib_obj_t temp_obj = {};
kernel_dynlib_obj(pid, 0, &temp_obj);
start = temp_obj.mapbase;
start_size = temp_obj.mapsize;
prot = kernel_get_vmem_protection(pid, start, start_size); // returned 4

[illusionyy]

Not quite the fix yet, so marking draft for now