fixes error while compiling binder with kernel versions 5.3

/var/lib/dkms/anbox/1/build/binder/binder.c:3406:11: error: initialization of ‘vm_fault_t (*)(struct vm_fault *)’ {aka ‘unsigned int (*)(struct vm_fault *)’} from incompatible pointer type ‘int (*)(struct vm_fault
 *)’ [-Werror=incompatible-pointer-types]
  .fault = binder_vm_fault,
           ^~~~~~~~~~~~~~~
/var/lib/dkms/anbox/1/build/binder/binder.c:3406:11: note: (near initialization for ‘binder_vm_ops.fault’)
cc1: some warnings being treated as errors


:+1:  fixed :+1:

… patch - 5.3 includes binderfs]