Free the bpf descriptor array after we are done with it. This probably isnt

that critical as the program exits after this point anyway, but this may
not always be the case.

usr.bin/netstat/bpf.c

@@ -116,4 +116,5 @@ bpf_stats(char *interface)
 		    d->bd_slen, d->bd_hlen, pname);
 		free(pname);
 	}
+	free(bd);
 }