poll kernel module: overhaul with prints everywhere

rootfs_overlay/lkmc/poll.sh

@@ -1,6 +1,7 @@
 #!/bin/sh
 # https://cirosantilli.com/linux-kernel-module-cheat#poll
 set -e
-insmod poll.ko
+insmod poll.ko "$@"
 ./kernel_modules/poll.out /sys/kernel/debug/lkmc_poll
+# TODO capture Ctrl+C and do this automatically.
 #rmmod poll